I'm new to this list

Hello: I am new to this list, so let me introduce myself. I am interested in early scientific and computing history. As such, I collect early computing literature and scientific letters. I am also interested in scientific and engineering Instruments, original and patent models, literature and illustrations prior to the 19th century. The first computer I learned to program was a DIGIAC 3080, followed by an early WANG (I'd love to find them again), and then 360 assembler and PL/1. I am interested in purchasing early scientific equipment, advertising literature, electromechanical calculators, vintage computers (Imsai, Altair, TRS80, SOL, Digiac, Scelbi, SWTPC, PET, and many, many others) and associated literature. I prefer working examples, but please contact me with a description of what you have available. I'll pay shipping costs for items of interest or pick up from most areas in the eastern U.S. I look forward to participating on this list. Thank you for reading this.