Crataegus in southern Michigan.
"Published by the State board of geological survey as a part of the report for 1906 and as a contribution to the Biological survey of the state authorized by Act 250, Session, 1905."Mode of access: Internet
Publisher: Lansing, Mich., Wynkoop Hallenbeck Crawford co., state printers,
Sorry, we are unable to provide the full text but you may find it at the following location(s):
http://www.hathitrust.org/acce... (external link)
http://hdl.handle.net/2027/mdp... (external link)