TLS, one page, 5.5 x 8.5, personal letterhead, April 13, 1969. Letter to Camilla L. Titcomb in response to a request for his participation at an event, in part: “Alas, alas, how it has come about I cannot say, but through some strange series of events I find that I am so much in demand as a speaker that my calendar is consistently filled up for three to six months in advance…What’s more, in order to keep the number of my commitments reasonable I am forced to ask a $600 speaking fee and to resist as best I can (considering my soft heart) any attempt to beat me down.” Below his signature, Asimov has added a humorous typed postscript, “P.S. I am worth it.” In fine condition, with small block of toning near top from tape on reverse. Accompanied by the original mailing envelope. RR Auction COA.