KDP categories · Top KDP authors
Drew Callahan: Amazon KDP author data
As of Nov 6, 2026, Drew Callahan has 15 books on Amazon, 7 of them on a best-seller list in the last 30 days (best rank #2), mostly in Rocks & Minerals, Lapidary, Mineralogy.
| Median price | $6.99 |
|---|---|
| Price range (middle 50%) | $6.99 – $8.99 |
| Median reviews | - |
| Total reviews | 0 |
| New books (30 days) | 5 |
| Breakout books (30 days) | 4 |
What stands out
- Median price $6.99, 63% below the median of their main category, Rocks & Minerals.
- 5 new books in the last 30 days, 4 of them broke into a Best Sellers list.
Drew Callahan's best-ranked books
-
Fossil Hunting for Beginners in the United States: A Practical U.S. Field Guide to Finding, Identifying, Collecting, and Displaying Fossils Safely and Legally (Beginner's Field Guides)
by Drew Callahan
- Price$9.99
- Reviews-
-
Rockhounding for Beginners in the United States: A Plain-English Guide to Finding Agates, Jasper, Quartz Crystals, Geodes, Petrified Wood, and Gemstones on Public Land (Beginner's Field Guides)
by Drew Callahan
- Price$6.99
- Reviews-
-
Rockhounding for Beginners in the United States: A Plain-English Guide to Finding Agates, Jasper, Quartz Crystals, Geodes, Petrified Wood, and Gemstones on Public Land (Beginner's Field Guides)
by Drew Callahan
- Price$9.99
- Reviews-
-
Fossil Hunting for Beginners in the United States: A Practical U.S. Field Guide to Finding, Identifying, Collecting, and Displaying Fossils Safely and Legally (Beginner's Field Guides)
by Drew Callahan
- Price$6.99
- Reviews-
-
Backyard Astronomy for Beginners: Find the Moon, Planets, Stars, and Deep-Sky Wonders with Your Eyes, Binoculars, or a First Telescope (Beginner's Field Guides)
by Drew Callahan
- Price$6.99
- Reviews-
- Published2026-08
-
Rock Tumbling for Beginners: A Practical Guide to Rotary Tumblers, Polishing Agate and Jasper, and Fixing Dull Stones (Beginner's Field Guides)
by Drew Callahan
- Price$7.99
- Reviews-
-
Stretching and Flexibility for Women Over 50: Gentle Chair-Assisted Routines for Easier Movement, Better Posture, and Safe Progress at Any Age (Fitness for Women Over 50 Book 4)
by Drew Callahan
- Price$0
- Reviews-
- Published2026-08
-
Balance Exercises for Women Over 50: An No-Equipment Plan to Improve Stability, Build Strength, Prevent Falls, and Move with Confidence at Home and Beyond (Fitness for Women Over 50 Book 3)
by Drew Callahan
- Price$6.99
- Reviews-
-
Walking for Fitness for Women Over 50: A Beginner’s Plain-English Plan to Build Endurance, Protect Your Joints, Manage Weight, and Feel Stronger Every Week
by Drew Callahan
- Price$0
- Reviews-
- Published2026-08
-
Chair Yoga for Women Over 50: A Beginner's Plain-English Guide to Gentle Seated Routines That Ease Stiffness, Build Strength, and Steady Your Balance in ... a Day (Fitness for Women Over 50 Book 7)
by Drew Callahan
- Price$0
- Reviews-
- Published2026-08
Main categories
FAQ
How many books does Drew Callahan have on Amazon?
KDPTop tracks 15 of their books; 7 made an Amazon list in the last 30 days.
Which categories does Drew Callahan publish in?
Their books chart most often in Rocks & Minerals, Lapidary, Mineralogy.
How does Drew Callahan price their books?
The median price is $6.99; half of the books cost $6.99–$8.99.
Has Drew Callahan released new books recently?
5 new books in the last 30 days, 4 of which reached a Best Sellers list.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.