gbookcards Reference Cards
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Want to author a Reference Card?
Authors are needed to compile reference cards for science, math, and programming language subjects. When you author a card, you receive a royalty of 20% of the sale of your cards. The graphic design, printing, and marketing of your reference card is done by gbookcards.com. Information on what were looking for and how to propose a reference card are here.
Fact checkers wanted!
As the gbook.org reference cards get more popular, errors are likely to found. If you find an error, or have a suggestion or improvement for a reference card, you can submit it here. If your change is implemented on the next printing of the card, you will receive a reference card for half price, with your changes included.