Except for the last, the links are incomplete. On 2023-03-20 08:06, Peter Stockdill wrote:
https://publib.boulder.ibm.com/epubs/book/ibmop002.boo https://publib.boulder.ibm.com/epubs/book/ibmol004.boo https://publib.boulder.ibm.com/epubs/book/ibmom002.boo https://publib.boulder.ibm.com/epubs/book/ibmot001.boo http://www.bitsavers.org/pdf/ibm/370/pli/LY27-9528-0_OS_PLI_Version_2_Problem_Determination_Dec87.pdf
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