Asa Gray correspondence. Senders Mo-Mu

By: Gray, Asa, - Mohr, Charles (Charles Theodore), - Montagne, Jean François Camille, - Morong, Thomas, - Morrow, James, - Muir, John, - Müller, Johannes, of Aargau, - Munro, William, - Munson, T. V. (Thomas Volney), - Murray, Amelia M. (Amel