Hummer, Bob: Six More Hummers ©1941 Bob Hummer, L.L. Ireland, IL Softcover, saddle-stitched, 5.5x8.5", 17 pages

Image courtesy eBay seller MagicCollectiblesPlus

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Contents (numbers are not page numbers):

1 The Four G Men
2 The Card on the Window Pane
3 Double Thought
4 A Rare Coin Stunt
5 A Possible Impossibility
6 Imagination