Older DEC manuals

Hello again, Further cleaning of a storage area revealed a three-ring binder containing the following DEC manuals, one of which surprised me: VT55 Programming Manual (AA-4949B-TC) DLV11-E and DLV11-F asynchronous line interface user's manual (EK-DLV11-OP-001) RL01/RL02 Disk Subsystem User's Guide (EK-RL012-UG-002) RX02 Floppy Disk System User's Guide PDP-11 Family Field Installation and Hardware Acceptance Reference Manual (EK-FS003-IN-002), the title page of which is stamped "COMPANY CONFIDENTIAL." My question on this one is, was it common for these field service manuals to find their way out into the wild? There is also a manual from Computer Devices, Inc., titled Miniterm 80/132 Printing Option (0008-03421G) Operation Manual Cheers, Dan