These specifications cover the production of mailers (consisting of various types of letters, inserts, return envelopes, and mail-out envelopes) and postcards requiring such operations as electronic p... These specifications cover the production of mailers (consisting of various types of letters, inserts, return envelopes, and mail-out envelopes) and postcards requiring such operations as electronic prepress, printing (including four-color process), variable imaging, binding, construction, inserting, and distribution. Complete specifications may be found at: https://www.gpo.gov/how-to-work-with-us/vendors/contract-opportunities