I have a print by Dexter Bowles called Bonnet and Basket plate No.1 1973... A print by James W. Hicks 1977 called Party Line 1977 plate no. 2 and... A Bill Granstaff print called Tuesday Morn memento Series plate no 17 1978. All prints are signed... Does anyone know how much they would be worth and any other information? Thank You!