The Greater Show World
This great trade publication, edited by Johnny J. Kline, covered carnivals, circuses, and the rest of the outdoor amusement world. It was first published on April 16, 1927 as The Show World, "The Blue Book of Show Land."
The publication ran monthly until about 1950(?). We are currently seeking more information and back issues of this publication.
A.J. Liebling's classic 1942 collection of essays, The Telephone Booth Indian, contains a great essay on Johnny J. Kline and "The Greater Show World."