Style: 1
Major Identifiers: Appeal's Pocket Series
In Use: 1919 - 1921
Colors: red, occasionally yellow
Major Identifiers: People's Pocket Series, upper/lower case italic script font for title, "scholar" image logo, editor, "Appeal To Reason" publisher
In Use: 1921
Major Identifiers: People's Pocket Series, upper/lower case script font for title, "scholar" image logo, editor, "Appeal To Reason" publisher
In Use: 1921
Style: 4
Major Identifiers: People's Pocket Series, editor, upper/lower case block font for title, "scholar" image logo, "Appeal Publishing Company" publisher
In Use: 1922
Style: 5
Major Identifiers: Appeal Pocket Series, editor
In Use: 1922
Colors: blue, occasionally white
Style: 6
Major Identifiers: Ten Cent Pocket Series, editor, "Haldeman-Julius Company" publishers
In Use: April 1922 - September 1923
Colors: blue only (other apparent colors are faded)
Style: 7
Major Identifiers: Five Cent Pocket Series, editor, "Haldeman-Julius Company" publishers
In Use: September 1923 only
Colors: blue only (other apparent colors are faded)
Style: 8
Major Identifiers: Pocket Series, editor, "Haldeman-Julius Company" publishers
In Use: October 1923 - November 1923
Colors: blue only (other apparent colors are faded)
Style: 9
Major Identifiers: Little Blue Book, editor, small series number, "Haldeman-Julius Company" publishers
In Use: November 1923 - 1924
Colors: blue only (other apparent colors are faded)
Style: 10
Major Identifiers: Little Blue Book, editor, large series number in bold, publisher credit removed
In Use: 1924 - 1939 (likely)
Colors: blue only (other apparent colors are faded)
Major Identifiers: Little Blue Book, editor, large series number in bold, unique H-J logo, "Haldeman-Julius Publications" publisher
In Use: 1933 - 1934 (likely)
Colors: blue only (other apparent colors are faded)
Major Identifiers: Little Blue Book, editor, large series number, "Published for Automatic Libraries" etc. inscribed within rectange, large union label
In Use: 1939 - 1940
Colors: blue only (other apparent colors are faded)
Major Identifiers: Little Blue Book, large series number not bold, editor, union label (sometimes with the numeral 1 after it), publisher credit removed
In Use: starting in 1940 (likely)
Colors: blue, yellow, orange, white, maybe others
Style: 14
Major Identifiers: Little Blue Book, large series number not bold, editor; author name in large caps
In Use: 1940 - ?
Style: 15
Major Identifiers: Little Blue Book, large series number not bold, editor; author name in medium caps, union label
In Use: 1940 - ?
Style: 16
Major Identifiers: Little Blue Book, large series number not bold, editor; author name in small caps
In Use: 1940 - ?
NOTE: This particular example has a spelling error in the author name: SAMUEI instead of SAMUEL.
Style: 17
Major Identifiers: Self Educator No. <x>, Little Blue Book, large series number (sometimes in a finer, thinner font), editor named, author name in upper case, no union label
In Use: 1943 - ?
Major Identifiers: Self Educator No. <x>, Little Blue Book, large series number, editor, union label
In Use: 1943 - ?
Major Identifiers: Cartoon-like graphic, usually no text on front except title (& sometimes author)
In Use: Late 1940's on, perhaps simultaneously with text-only cover ???
Major Identifiers: Little Blue Book, editor, large series number; author name in all caps; copyright date and "Printed in U.S.A." at bottom
In Use: 1948 [earlier/later dates possible]
Major Identifiers: Knowledge of Life Series with large torch logo, no publisher or editor or number mentioned
In Use: ?
Major Identifiers: Self-Help Library (no flame), no publisher or editor or number mentioned
In Use: ?
Major Identifiers: Self-Help Library (flame logo), no publisher or editor or number mentioned
In Use: ?
Major Identifiers: Little Blue Book, large series number, editor name removed
In Use: post-1951
NOTE: The generic post-EH-J cover — the key is that the ditor's name is gone from the cover as well as from inside pages
Major Identifiers: Little Blue Book, large series number, editor, "Property of:" with line(s) for name
In Use: ?
NOTE: Serial number on back
Major Identifiers: editor name removed, "Property of:" with line(s) for name,
In Use: 1952 - ???
NOTE: Back of this example shows 15¢ price & serial number
Major Identifiers: editor name removed, "University In Print" logo
In Use: 1952 - ???
NOTE: Multiple colors of both background and ink; list of books related to this title's genre on the back
Major Identifiers: Large number but no reference to editor, no reference to Little Blue Books, large text
In Use:1952 - ???
Major Identifiers: Large number with reference to Little Blue Books on cover at top with large numbers, large text, no reference to editor
In Use: 1952 - ???
Major Identifiers: Small number, no reference to Little Blue Books or editor, some graphic devices, large text
In Use: 1952 - ???
Major Identifiers: Large number above large text labeled as "BooK No." in initial caps, no reference to Little Blue Books or editor
In Use: 1952 - ???
Major Identifiers: Large number below large text labeled as "BOOK NO." in all caps, no reference to Little Blue Books or editor
In Use: 1952 - ???
Major Identifiers: Large number but no reference to editor, no reference to Little Blue Books, Photo on front cover
In Use: ?
