From the American Postal Workers Union:
The 2017 Joint Contract Interpretation Manual (JCIM), a resource for the administration of the 2015-2018 Collective Bargaining Agreement, is prepared and at the printer! In less than two weeks, members can order their bound JCIM for $6 from the APWU Store . Click here for an electronic copy.
The JCIM is an APWU and the USPS jointly prepared manual. It serves to address and resolve disputes as well as ensure contract compliance.
Source: JCIM is Available Online | APWU