Please contact us at:

Principia Publishing, Inc.
P.O. Box 98950
Seattle WA 98198 USA
Phone: 253-815-7821
email: ppi@zns.com

It will help us greatly if, in your email messages to us, you would please use "PPI: " (P + P + I + colon + space) as the first five (5) characters of your Subject field.