http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Introduction to practical forest tree improvement
by J.P. van Buijtenen, G.A. Donovan, E.M. Long, J.F. Robinson and R.A. Woessner.
Includes bibliographical references (page 17).