This is a quintessential public domain book about drawing anatomy. This is also a work in process to see if we at Openclipart can stretch the boundary of Openclipart and become more productive in our workflow. This book was originally by George Bridgmen. https://en.wikipedia.org/wiki/George_Bridgman Here is the full book and records for it: https://archive.org/details/constructiveanat00briduoft
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