VMS Help PASCAL, file-spec/LIBRARY D=none  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Specifies that a file is a text library file.  The text  library
  specification  is required.  The text library files in a list of
  source files must  be  concatenated  by  plus  (+)  signs.   The
  default  file  type  for  a  text library is .TLB.  The %INCLUDE
  directive in a Pascal program allows you to extract modules from
  text libraries.