From Drawing Made Easy by Edwin George Lutz, 1921.

"What strange predicaments do we find ourselves in?"  From Wittenberg College's 1927 yearbook.

From The Book of Indian Crafts and Indian Lore by Julian Harris Salomon, 1928.

From The Story of Mankind by Hendrik Willem Van Loon, 1923.  (So many inaccuracies in this book, but then again history books have always offered the most fiction.)

From Adventure, 1927.

From Photoplay Magazine, 1920.

From The Canadian Readers Book I, 1922.

From Oklahoma A & M College's 1928 yearbook.  See How to Hoodoo Hack a Yearbook.

From The Children's Newspaper, 1928.

"Be calm, gentlemen!"  From The Film Daily, 1927.

From Busy Little Brownies by Nataniel Moore Banta and illustrated by Dorothy Dulin, 1923.

From Drawing Made Easy by Edwin George Lutz, 1921.

From The Art of Pantomime by Charles Aubert, 1927.

From Wee Wisdom, 1928.

Answers: Rotate the image counter-clockwise and look for bearded King Neptune and his trident in the space between the tree and the hillside.  The smaller mermaid's face is in the water touching the shoreline, below left of the shell. 

From Our Bird Friends and Foes by William Atherton DuPuy and illustrated by George Miksch Sutton, 1925.

From Sundial Dahlia Gardens by Mrs. C. R. Stewart Leckie, 1928.

A "Pair" tree.  From David Lipscomb College's 1929 yearbook.

"Hades, New Mexico."  From Laughing Horse, 1924.

From The Children's Newspaper, 1926.

From The Canadian Readers Book II, 1924.