The collection consists of six small ink and pencil sketches of Oregon landscapes that William H. Dierdorff made in 1896 and a brief biography of Dierdorff by his grandson, William Henry Dierdorff III. The sketches have dates and notes at the bottom to indicate which hymns the organist at the Presbyterian church in Tualatin Plains, Oregon, should perform for the service on the indicated date. Five of the sketches have notes on the back indicating the location portrayed: Willamette Falls; a ship and rocks near Netarts Bay; the Yamhill and Tillamook Stage Road; the wharf at Garibaldi; and Garibaldi Beach. The sketch without a location label depicts a river scene with a tent on the shore in the background. The collection also holds a photocopy of an explanatory note about the sketches written in 2000 by Dierdorff's granddaughter, Dessie Lou Hodges.

The biography, written in 2008 and editied in 2020, includes typescripts of Dierdorff's obituary in the Hillsboro Argus and a letter that he wrote to his wife in 1901, and four photographs of Dierdorff at different ages.