The Society of Architectural Historians
The Society of Architectural Historians (SAH) and its members invite the support and active participation of all who share an interest in architecture, past, present, and future. Founded in 1940, the Society encourages scholarly research in the field and promotes the preservation of significant architectural monuments that are an integral part of our worldwide historical and cultural heritage. The Society's 3,500 members include architectural historians, architects, preservationists, students, professionals in allied fields and the interested public. SAH provides an international forum for those who care about architecture and its related arts.
I've been using Koh-I-Noor Rapidograph Technical Pens since 1969. My aunt bought me my first set when I was 12 and I have used them daily ever since. I love the fact that I can mix my ink colors to match my watercolor or my wardrobe and use "Pelikan Drawing Ink A" almost exclusively. Though the inks made by Koh-I-Noor and Winsor Newton are satisfactory.
If you are a beginner, I would NOT recommend purchasing anything smaller than an 0 (0.35 mm). Even as a professional I find cleaning a 4x0 to be a challenge. I work most often with a 2x0, and find them to produce the smoothest flow, if kept clean.