Seventh annual report on the progress of the topographical survey of the Adirondack region of New York : to the year 1879. Containing the condensed reports for the years 1874-75-76-77 and '78. With late results in geodetic and trigonometrical measurements, magnetic variation, hydrography, river surveys, leveling and barametric-hypsometry, meteorology, rain-fall, botany, zoölogy and geology. With maps, engravings and chromo-lithographs