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Available from [http://www.amazon.co.uk/APL-Introduction-Graeme-Donald-Robertson/dp/0952416719/ref=sr_11_1?ie=UTF8&qid=1233844677&sr=11-1 Amazon] | Available from [http://www.amazon.co.uk/APL-Introduction-Graeme-Donald-Robertson/dp/0952416719/ref=sr_11_1?ie=UTF8&qid=1233844677&sr=11-1 Amazon] | ||
[http:// | [http://robertson.uk.net/Files/APL1&2.pdf Download as a free PDF] | ||
=== A Practical Introduction to APL 3 & APL 4 === | === A Practical Introduction to APL 3 & APL 4 === |