Cite

Sketch map of Rhenish Prussia.

MLA

Sketch Map of Rhenish Prussia. G.S.G.S, 1919. https://collections.library.yale.edu/catalog/15483015.

APA, 6th edition

Sketch map of Rhenish Prussia. (1919). [Maps]. G.S.G.S, https://collections.library.yale.edu/catalog/15483015.