[APL At A Glance](https://archive.org/details/apl-2-at-a-glance-brown-pakin-polivka) [APL - An Interactive Approach](https://archive.org/details/aplaninteractive0000gilm) [APL on RosettaCode](https://rosettacode.org/wiki/Category:APL) [Setting up your Linux keyboard for APL programming](https://dangerruss-things.blogspot.com/2021/03/getting-started-with-apl-keyboard.html)
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