In Percy's collection.
American Heritage article (https://www.americanheritage.com/discovered-first-maps-american-revolution?issue=133859&fbclid=IwZXh0bgNhZW0CMTEAAR7_oIrl8pVJy965BjiW6fY2mvjd5j8t8vrXEWxCCSHuqwt8WRZj05d8VqJ51w_aem_bCGqtigIH9yPhKGtpYUOEA#kkf0d0hkmqmawrvf3lqse3s3vzxsec8)