2019
Written by Markus Beldig
Work of Markus Beldig, Mike Porstmann

5 pages (Loose-leave collection), published by Selfpublished
Illustrated with drawings by Susanne Hangschlitt
Language: English

2 entries

Creators	Title	Comments & References		Page	Categories
Markus Beldig	Introduction / Acknowledgements			2	Articles / Intros & Epilogues Paper / Envelopes / Switching with single Envelope & Two-Way Envelopes
Mike Porstmann	Double Decker	two-way envelope	Also published here Double-Decker (Mike Porstmann, 1997)	2	Paper / Envelopes / Switching with single Envelope & Two-Way Envelopes

Data entered by Denis Behr, May 2019.

The Double Decker