| 2025-12-07 | Trees commonly confused with birches |
| 2025-03-24 | Utah's state trees |
| 2025-01-30 | Shakers in the woods |
| 2023-11-23 | Trees that form colonies from a single root system |
| 2022-06-04 | Rocky Mountain National Park sights |
| 2020-08-20 | White-barked trees |
| 2019-12-09 | "Quaking" trees |
| 2019-11-30 | Trees that "at the cross-roads talk together," in an Edward Thomas poem |
| 2017-09-01 | Ones trembling not out of fear |
| 2016-04-10 | Trembling trees |
| 2013-04-05 | Common sights in the Rockies |
| 2010-07-24 | Sources of woods used for saunas |
| 2009-12-06 | Spectacular autumn trees |
| 2008-07-14 | Forest quakers |
| 2007-12-26 | Quakers in the woods |
| 2005-04-12 | Trembling trees |
| 2002-08-03 | Certain poplars |
| 2001-12-31 | Trembling trees |
| 2000-12-31 | Poplars |
| 2000-11-25 | Classic nature subjects for Ansel Adams |
| 2000-10-13 | Quakers |
| 2000-01-02 | Sights on ski slopes |
| 1999-05-16 | Quakers |
| 1999-01-08 | Trees with sawtooth-edged leaves |
| 1996-09-12 | Stand in the Rockies |
| 1994-06-12 | Quakers |
| 1994-02-09 | Quakers |