According to Corvallis "
A very large, slightly oval Asian type pear developed as a selected seedling by Mr. Charles Harris and reported by him in Pomona. Vigorous tree on calleryana - appears to need about 400 - 450 chill hours.
‘Charles Harris - an Asian pear named after myself. It is a huge pear I selected from several Chinese seedlings. The fruits are oblong, extremely juicy and sweet. It produces some fruit nearly every year. This sort begins ripening in late August and will continue maturing through October in Zone 8. It is a heavy-bearer and its fruit reaches a weight of three pounds under the best conditions. It has very high resistance to fireblight.’ – Pomona 24(3):9. 1991
Pear Tree Commemorates Bicentennial Of Bill Of Rights By BILL MCLAUGHLIN Daily Press | December 25, 1991 The Williamsburg Chapter, Daughters of the American Revolution, recently planted a rare pear tree on the Rawls Byrd Elementary School campus to commemorate the bicentennial of the Bill of Rights. The tree is named for Greta Klingon, second vice regent of the local DAR Chapter. It is a hybrid developed by Charles Harris of Griffin, Ga., from a pear tree growing in the Jekyll Island, Ga., yard of Greta and A.J. Klingon. It is marketed for the first time this year by Ison’s Nursery in Brook, Ga. The catalog describes the “Greta Klingon” as a “very exciting European type dessert pear.” (not sure if this is the same as the ‘Charles Harris’ pear)." - https://npgsweb.ars-grin.gov/gringlobal/accessiondetail.aspx?accid=%20PI+617599