Combinatorial Algorithms For Computers and Calculators by Albert Jijenhuis and Hebert S. Wilf. (PDF)
I suspect the word “calculators” betrays the age of this item. This edition was published in 1978. Still, Amazon is currently asking > $50.00 U.S. for it so at least knowing about it can save you some money.
Not that the algorithms covered have changed but the authors say that combinatorics changed enough between 1975 and 1978 to warrant a second edition.
I suspect that is true several times over between 1978 and 2014.
Still, there is value in a different presentation than you would see today, even without the latest content.
I first saw this in a tweet by Atabey Kaygun.