Note: Peekskill used to be part of Cortlandt Township, and this has caused some labelling confusion. Many localities are labelled "Peekskill" because that is the closest urban center, but are technically now in Cortlandt.
References
Manchester, J.G. (1931) The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, 86.
Mineral List
Mineral list contains entries from the region specified including sub-localities
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