Chris Curnow (1937–2023) the Project Manager at Distributed Proofreaders who selected this book, and more than 2200 others, to be preserved as free digital transcriptions by Project Gutenberg. The source scans used are from the Dover edition, published in 1962, an unabridged republication of the work first published by the United States Government Printing Office. Part I was originally published in 1927 as Smithsonian Institution United States National Museum Bulletin 142; Part II was originally published in 1929 as Smithsonian Institution United States National…
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