VAX/VMS 4.0 and 4.1 source microfiche posted on Bitsavers
This is kind of interesting, the published source code for VAX/VMS 4.0 and 4.1 have been scanned in from micro fiche and posted on Bitsavers:
http://www.bitsavers.org/pdf/dec/vax/microfiche/vms-source-listings/
http://www.bitsavers.org/pdf/dec/vax/microfiche/vms-source-listings/