@article{1786,
      note = {Includes index.},
      author = {Petrides, George A.},
      url = {http://library.usi.edu/record/1786},
      title = {A field guide to trees and shrubs; field marks of all  trees, shrubs, and woody vines that grow wild in the  northeastern and north-central United States and in  southeastern and south-central Canada,},
      publisher = {Houghton Mifflin,},
      recid = {1786},
      pages = {xxxii, 428 p.},
      address = {Boston,},
      year = {1972},
}