The bulk of the collection consists of 1,381 sermons delivered by Blackmer between 1898 and 1956. There are also some addresses, prayer meeting talks, sermon outlines, job-study broadcasts, and funeral addresses.

This collection is organized into six series:

• 1. Sermons, 1898-1956
• 2. Addresses, 1899-1951
• 3. Funeral Addresses
• 4. Prayer Meeting Talks, 1930-1939
• 5. Job-Study Broadcasts, 1950-1954
• 6. Sermon Outlines, 1904-1942

Within each series, arrangement is chronological. Items in Series 1 and Series 2 are numbered sequentially.