http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Introduction to practical forest tree improvement
Forest Genetics Laboratory, Texas Forest Service
by J.P. van Buijtenen, G.A. Donovan, E.M. Long, J.F. Robinson and R.A. Woessner.
Includes bibliographical references (page 19).