First Biennial Report of the Progress of the Geological Survey of Michigan, Embracing Observations on the Geology, Zoo.Logy and Botany of the Lower Peninsula. Made to the Governor, December 31, 1860 12+

📗 Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.