Binder's title: Playfair's Euclid. At head of title: Dean's stereotype edition. https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries ...

People have long learned - and taught - mathematics by working problems. These sheets, written between 1913 and 1950, contain problems in trigonometry worked by Worcester, Massachusetts, mathematics ...

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One of the more wonderful things about modern urban living is the ability to get practically anything delivered to your doorstep with a few taps on a keyboard or phone. Sick and need meds and soup? No ...

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