Cover for How to Make a Photocatalytic Air Purifier

How to Make a Photocatalytic Air Purifier

By Stefan Hollos and J. Richard Hollos

Format and pricing:
Paperback 5.5 x 8.5 inch (49 pages) $9.95, pdf $6.95
ISBN: 9798852420602 (paperback)
Publication date: July 2023

Cover for Buddhism: the essentials

Buddhism: the essentials

Created by Stefan Hollos and J. Richard Hollos

Format and pricing:
Paperback 5.0 x 8.0 inch (72 pages) $9.95
Pdf $0.00+ (pay what you want)
ISBN:
9781887187466 (paperback)
Publication date: May 2023