Bibliography includes document type

[Rich Shepard]

This is a new issue with kbibtex. Technical report reference in the
bibliography include the document type, Tech. rept., even though that's not
in the bibtex source in the kbibtex database. Three examples of the output
and their source listings (minus the abstracts):

Brinson, M.M. 1993. A hydrogeomorphic classification for wetlands. Tech.
rept. Technical Report WRP-DE-4. US Army Corps of Engineers, Waterways
Experiment Station.

@techreport{Brinson1993,
 	abstract = {...},
 	author = {Brinson, M.M.},
 	institution = {US Army Corps of Engineers, Waterways Experiment Station},
 	keywords = {wetlands, geomorphology, hydrology, ecology},
 	number = {Technical Report WRP-DE-4},
 	pagetotal = {103},
 	subtitle = {Wetlands Research Program},
 	title = {{A Hydrogeomorphic Classification for Wetlands}},
 	year = {1993}
}

Cowardin, L.M., Carter, V., Golet, F.C., & LaRoe, E.T. 1979. Classification
of wetlands and deepwater habitats of the united states. Tech. rept.
FWS/OBS-79/31. Office of Biological Services, Fish and Wildlife Service.

@techreport{Cowardin1979,
 	abstract = {...},
 	author = {Cowardin, L.M. and Carter, V. and Golet, F.C. and LaRoe, E.T.},
 	institution = {Office of Biological Services, Fish and Wildlife Service},
 	keywords = {wetlands, classification, habitats},
 	number = {FWS/OBS-79/31},
 	pagetotal = {103},
 	title = {{Classification of Wetlands and Deepwater Habitats of the United States}},
 	year = {1979}
}

Farnsworth, R.K., & Thompson, E.S. 1982. Mean monthly, seasonal, and annual
pan evaporation for the united states. Tech. rept. NOAA Technical Report NWS
34. Office of Hydrology, National Weather Service.

@techreport{Farnsworth1982,
 	abstract = {...},
 	author = {Farnsworth, R.K. and Thompson, E.S.},
 	institution = {Office of Hydrology, National Weather Service},
 	keywords = {evaporation, hydrology, wetlands, methods},
 	number = {NOAA Technical Report NWS 34},
 	pagetotal = {91},
 	title = {{Mean Monthly, Seasonal, and Annual Pan Evaporation for the United States}},
 	year = {1982}
}

Journal articles and books do not have their document type included in the
bibliography; for example,

@article{Grier1977,
 	abstract = {...},
 	author = {Grier, C.C. and Running, S.W.},
 	journal = {Ecology},
 	keywords = {coniferous forests, forest structure, leaf area, moisture gradients, Oregon, site water balance, evaporation},
 	pages = {893–899},
 	title = {{Leaf area of mature northwestern coniferous forests: relation to site water balance}},
 	volume = {58},
 	year = {1977}
}

Since the string, 'Tech. rept.' does not appear in the bibtex source I don't
know where to look to find why it appears in the compiled document's
bibliography. All ideas welcome.

Regards,

Rich