Gerlach, Mock, and Klein in Hesse

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Excuse the English, but I am looking for information to any Gerlach, Mock, or Klein from the Hesse area, particularly around Giessen.

Anyone related to:
Karl Ludwig Gerlach - 23 Nov 1909 Vetzberg - 14 Jun 1944 Normandie, France
Heinrich Klein - born before 1900
Elisabetha Mock - likely born before 1900 in Kirch-Gons, Hesse.

Thank you!