Here we list public domain academic papers. They must be public domain in the country of origin, not just the US, which had generally less stringent timings with the 95 year after publication rule rather than life + 70, which often ends up being publication + 110/120. Once these are reached, they may be upload to Wikimedia Commons!
Their txt formats are so crap!
E.g. for;
wget -O pap.txt
a good one is:
perl -0777 -pe 's/(?<!\r\n)\r\n(?!\r\n)( +)?/ /g' pap.txt
The ( +)? is for the endlessly many quoted letters they have, which use four leading spaces per line as a quote marker.