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From "17 Practical Uses for Lego in Your Everyday Life" on Mashable.

http://mashable.com/2014/02/25/lego-uses/?utm_cid=mash-com-Tw-main-link

"Fun with Buttons." The Junior Home Play Book.  The D.C. Kreidler Company, Chicago. 1929.

The Junior Home Play Book. The D.C. Kreidler Company, Chicago. 1929.

Mark Steadman
Museum for the History of Science, Technology and Medicine
School of Philosophy, Religion and History of Science
University of Leeds

Mark Steadman
Museum for the History of Science, Technology and Medicine
School of Philosophy, Religion and History of Science
University of Leeds