Manual of regulations for official traffic signs, signals and markings.

"Revises and supersedes the Manual of regulations published in 1943."

List of lights and fog signals of the United States on the Pacific coast of North America and on the Hawaiian and Midway Islands and of the lights and fog signals of the Dominion of Canada on the coast of British Columbia

Title varies slightly

Heredity and social fitness; a study of differential mating in a Pennsylvania family,

"Paper no. 32 of the Station for experimental evolution at Cold Spring Harbor, New York."