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This is a fine example of Volume XX of the Palmer Green Books. Precise, Posture-Constant Spinograph Comparative Graphs is also known as 'the big orange one' and is one of the less-common and more sought after. These are ring-bound and soft-covered so this particular Vol XX makes a great and well-kept example.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.