95 S C 2012 23g West Point, New York S C 2013 23h West Point, New York S C 2014 23i West Point, New York S C 2015 23j Round Pond near West Point, New York S C 2016 23k Mud of Hudson River, West Point, New York; J.W. Bailey S C 2017 23l West Point, New York S C 2018 23m West Point, New York; April 11, 1849 S C 2019 23n West Point, New York S C 2020 23o West Point, New York S C 2021 23p West Point, New York S C 2022 24a Maidstone, Vermont S* C 2023 24b New Durham and Derry, [New Hampshire]. [Two cover- glasses on a single slide.] S C 2024 25a Near Tarrytown, Westchester County, New York S C 2025 25b Croton, New York S C 2026 26a Derry, New Hampshire S C 2027 27a Cherryfield, Maine; D.B.S. Shaw, Boston S C 2028 27b Blue Hill Pond, Maine; no. 1 and no. 2 S* P C 2029 28a Boston Harbor, Massachusetts. [Paleograph left with slide; no coverglass on slide.] S* P C 2030 28b Boston Harbor, Massachusetts. [Paleograph left with slide; no coverglass on slide.] S* C 2031 28c Boston, Massachusetts S C 2032 28d Boston, Massachusetts S C 2033 28e Boston Harbor, Massachusetts S C 2034 28f Massachusetts Bay, Massachusetts S C 2035 28g Wendell, Massachusetts; Dr. Deane S C 2036 28h Wrentham, Massachusetts; siliceous infusoria acted upon by hydroflouric acid S C 2037 28i Salem, Massachusetts; Essex Co., New Hampshire Collections