Old documents are useful on fireblight resistant pears!

Old documents are very useful on fireblight resistant pears such as this one http://trace.tennessee.edu/cgi/viewcontent.cgi?article=1167&context=utk_agbulletin&sei-redir=1&referer=http%3A%2F%2Fsearch.yahoo.com%2Fsearch%3B_ylt%3DA0LEVw1yqKBYZswA6Wlx.9w4%3B_ylu%3DX3oDMTE5cHBjbTFkBGNvbG8DYmYxBHBvcwMxBHZ0aWQDVUkyRkJUM18xBHNlYwNyZWwtYm90%3Fp%3Ddabney%2Bpear%2Btree%26_tsrc%3Dapple%26ei%3DUTF-8%26fr2%3Drs-bottom%2Cp%3As%2Cv%3Aw%2Cm%3Aat-s%26fr%3Diphone#search=“dabney%20pear%20tree”. The document offers insight that cannot be found elsewhere on old pears I’m researching such as Dabney. What is your experience on old fruits? Have any of the best varieties been forgotten? They certainly have with pears. Many times the old pears did not ship well, keep well or were not big enough etc. but were far better tasting pears than anything in the grocery store.