Hmm, you may be in luck. That one looks like it's in the parent directory of the second link: http://www.bitsavers.org/pdf/dec/pdp10/TOPS10/1973_Assembly_Langua

Hmm, you may be in luck. That one looks like it's in the parent directory of the second link: http://www.bitsavers.org/pdf/dec/pdp10/TOPS10/1973_Assembly_Language_Handbook/ http://www.bitsavers.org/pdf/dec/pdp10/TOPS10/1973_Assembly_...