Below are several links to further helpful resources. The OPC church directory will help you to locate an OPC congregation near you. The Audio Sermons page provides links to audio sermons hosted by local congregations. Great Commision Publications is the joint publishing arm of the OPC and the PCA. The Trinity Hymnal Resources page contains a thorough database of the original Trinity Hymanal published in 1961. This searchable database also includes MIDI files for many of the tunes. Please click on the following links to access these resources.