FWIW, there is a small group in Texas which includes Calvin's Geneva Catechism among its authoritative doctrinal standards, along with the Westminster Standards, the Three Forms of Unity and others.

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Andrew Myers
Husband of Jessica, Father of Jackson, Katie and Samuel
Member, Presbyterian Reformed Church of Northern Virginia
Warrenton, VA USA
Editor, The Matthew Poole Project

"Let your Morning Thoughts, and your last Evening Thoughts, be what shall become of you to all Eternity." -- Matthew Poole