The Elements of Style by William Strunk/Project Gutenburg

1920 edition, click here.

A Mother's List of Books for Children/Project Gutenberg

A wonderful reference for finding public domain children's books. These books are listed by age, ages two - fourteen, and topic. I've already found quite a few at Google Books for my thirteen year old, of which I'll be sharing over the next week.

Click here. HTML version is the easiest to work of off with searches - quick copy and paste.

1911 Encyclopedia Britannica

Free and online with enhanced search properties

Download here(plain text only), AKA: The Project Gutenberg Encyclopedia, Volumes 1-28.

A Dictionary of the English Language/Google Books

Title: A Dictionary of the English Language
Author: Noah Webster
Publisher: American Book Co., 1892
Overview

A Guide to Systematic Readings in the Encyclopedia Britannica

Many courses of study and reading guides.

A guide to systematic readings in the Encyclopedia Britannica: new & revised ed
Author James Baldwin
Publisher Werner co., 1897

Overview

Encyclopedia Britannica here.

A Companion(Study Guide) to the Iliad, for English Readers/Google Books

A companion to the Iliad, for English readers
Author Walter Leaf
Publisher Macmillan and co., 1892
Length 411 pages

Overview

The Encyclopedia Britannica: A Dictionary of Arts, Sciences, Literature and General Information, Volume 24/Google Books

The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, Literature and General Information

Click here.

Special Method in the Reading of Complete English Classics/Google Books

A general study guide for fourth through eighth grade students.

Special Method in the Reading of Complete English Classics in the Grades of the Common School
Author Charles Alexander McMurry
Publisher Macmillan, 1904
Length 254 pages

Overview

Chapter Three is most useful followed by the list of books.

The Book of Knowledge/Google books

The book of knowledge: or, An explanation of words and things connected with all the arts and sciences
By George Crabb
Publisher Leavitt & Allen
Original from the New York Public Library
Length 368 pages

Overview here.

How to Study/Google Books

Overview

How to Study
Author George Fillmore Swain
Publisher McGraw-Hill book company, inc, 1917
Length 65 pages

An Elementary Text-book of the Microscope/Google Books

Click here.

Main page

An elementary text-book of the microscope: Including a Description of the Methods of Preparing & Mounting Objects

By John William Griffith

Published by Voorst, 1864

197 pages

The World's Story An Outline of Universal History/Google Books

Suitable for high school, or useful as a teacher's guide.

The World's Story: A History of the World in Story, Song and Art, Ed. by Eva March Tappan, published by Houghton Mifflin company, 1914

Click here.

Great Men and Famous Women. Vol. 1 of 8 & Great Events by Famous Historians, Volumes 1-21./Project Gutenberg

Horne, Charles F. (Charles Francis), 1870-1942:

• The Great Events by Famous Historians, Volume 01 (English) (as Editor)
• The Great Events by Famous Historians, Volume 02
  (From the Rise of Greece to the Christian Era) (English) (as Editor)
• The Great Events by Famous Historians, Volume 03 (English) (as Editor)
• The Great Events by Famous Historians, Volume 04 (English) (as Editor)
• The Great Events by Famous Historians, Volume 05
  (From Charlemagne to Frederick Barbarossa) (English) (as Editor)
• The Great Events by Famous Historians, Volume 06
  (From Barbarossa to Dante) (English) (as Editor)
• The Great Events by Famous Historians, Volume 07 (English) (as Editor)
• The Great Events by Famous Historians, Volume 08
  The Later Renaissance: from Gutenberg to the Reformation (English) (as Editor)
• The Great Events by Famous Historians, Volume 09 (English) (as Editor)
• The Great Events by Famous Historians, Volume 10 (English) (as Editor)
• The Great Events by Famous Historians, Volume 11 (English) (as Editor)
• The Great Events by Famous Historians, Volume 12 (English) (as Editor)
• The Great Events by Famous Historians, Volume 13 (English) (as Editor)
• The Great Events by Famous Historians, Volume 17 (English) (as Editor)
• The Great Events by Famous Historians, Volume 21
  The Recent Days (1910-1914) (English) (as Editor)
• Great Men and Famous Women. Vol. 1 of 8
  A series of pen and pencil sketches of the lives of more
  than 200 of the most prominent personages in History (English) (as Editor)
• Great Men and Famous Women. Vol. 2 of 8
  A series of pen and pencil sketches of the lives of more
  than 200 of the most prominent personages in History (English) (as Editor)
• Great Men and Famous Women. Vol. 3 of 8
  A series of pen and pencil sketches of the lives of more
  than 200 of the most prominent personages in History (English) (as Editor)
• Great Men and Famous Women. Vol. 4 of 8
  A series of pen and pencil sketches of the lives of more
  than 200 of the most prominent personages in History (English) (as Editor)
• Great Men and Famous Women. Vol. 5 of 8
  A series of pen and pencil sketches of the lives of more
  than 200 of the most prominent personages in History (English) (as Editor)
• Great Men and Famous Women. Vol. 6 of 8
  A series of pen and pencil sketches of the lives of more
  than 200 of the most prominent personages in History (English) (as Editor)
• Great Men and Famous Women, Vol. 7 of 8
  A Series of Pen and Pencil Sketches of the Lives of More Than 200 of the Most Prominent Personages in History (English) (as Editor)
• Great Men and Famous Women, Vol. 8 (of 8)
  A series of pen and pencil sketches of the lives of more
  than 200 of the most prominent personages in History (English) (as Editor)

Speech Training for Children/Google Books

Click here.

The Personality of the Teacher By Charles McKenny/Google Books

Click here.

Children's Literature: A Textbook of Sources for Teachers/Google Books

Click here.

Reading Guides by Grade

From The Baldwin Project and Yesterday's Classics Pageant of History(on my sidebar), helpful reading lists by grade for public domain books:

Baldwin Project grades K through six.

Yesterday's Classics years 0 - 6(Charlotte Mason).

Not in public domain, but a helpful reading list of children's historical novels along a timeline. See Bethlehem Books Living History Library offered through Seton Educational Media.

Librivox: Source of Free Audiobooks

Librivox is an extensive library of free public domain audiobooks. Written summaries are included. Check the genres; there are many listed under the Children's genre which may match free online texts. A good number of the classics are available and the narration is very good. Click here. All recording as in public domain.

Literature Guide by Subject and Grade Level

Click in title.

Guide to Selecting Children's Literature/Google Books

The Children's Reading by Frances Jenkins Olcott.