R. H. Boll's Lessons on Mark (2d Ed.) has been compiled from the International Sunday School Lessons for first two quarters for 1928. They were first published in The Word and Work as follows:

      First Lord's Day Lesson of January. Lesson 1. January 1, 1928. John the Baptist and Jesus (Mark 1:1-11). The Word and Work 21 (January 1928): 23-24.
      Second Lord's Day Lesson of January. Lesson 2. January 8, 1928. Jesus and the Sick (Mark 1:21-34). The Word and Work 21 (January 1928): 25-27.
      Third Lord's Day Lesson of January. Lesson 3. January 15, 1928. Jesus and Sinners (Mark 2:3-12, 15-17). The Word and Work 21 (January 1928): 27-29.
      Fourth Lord's Day Lesson of January. Lesson 4. January 22, 1928. Jesus and the Law (Mark 2:18-22; 3:1-6). The Word and Work 21 (January 1928): 29-31.
      Fifth Lord's Day Lesson of January. Lesson 5. January 29, 1928. The Growing Fame of Jesus (Mark 3:7-12; 6:53-56). The Word and Work 21 (January 1928): 31-32.
      First Lord's Day Lesson of February. Lesson 6. February 5, 1928. Jesus Misunderstood and Opposed. (Mark 3:19b-27; 6:1-6). The Word and Work 21 (February 1928): 56-58.
      Second Lord's Day Lesson of February. Lesson 7. February 12, 1928. Jesus Pictures the Kingdom of God (Mark 4:26-34). The Word and Work 21 (February 1928): 58-59.
      Third Lord's Day Lesson of February. Lesson 8. February 19, 1928. Two Miracles of Power (Mark 4:35-41; 5:15-19). The Word and Work 21 (February 1928): 60-62.
      Fourth Lord's Day Lesson of February. Lesson 9. February 26, 1928. Other Mighty Works of Jesus (Mark 5:22-27, 32-36, 41, 42). The Word and Work 21 (March 1928): 62-63.
      First Lord's Day Lesson of March. Lesson 10. March 4, 1928. Jesus and the Twelve (Mark 3:13-15; 6:7-13). The Word and Work 21 (March 1928): 91-92.
      Second Lord's Day Lesson of March. Lesson 11. March 11, 1928. Jesus Feeds the Multitude (Mark 6:31-44). The Word and Work 21 (March 1928): 92-94.
      Third Lord's Day Lesson of March. Lesson 12. March 18, 1928. Jesus Teaches Sincerity (Mark 7:1-13). The Word and Work 21 (March 1928): 94-95.
      Fourth Lord's Day Lesson of March. Lesson 13. March 25, 1928. Jesus Proclaims the Kingdom of God (Review). The Word and Work 21 (March 1928): 96.
      First Lord's Day Lesson of April. Lesson 1. April 1, 1928. Jesus the Suffering Messiah (Mark 8:27-37). The Word and Work 21 (April 1928): 119-120.
      Second Lord's Day Lesson of April. Lesson 2. April 8, 1928. The Resurrection (Mark 16:1-8, 19, 20). The Word and Work 21 (April 1928): 120-122.
      Third Lord's Day Lesson of April. Lesson 3. April 15, 1928. Transfiguration and Service (Mark 9:2-8, 17, 18, 25-29). The Word and Work 21 (April 1928): 122-124.
      Fourth Lord's Day Lesson of April. Lesson 4. April 22, 1928. Jesus and the Home (Mark 10:2-9, 13-16). The Word and Work 21 (April 1928): 124-126.
      Fifth Lord's Day Lesson of April. Lesson 5. April 29, 1928. The Cost of Discipleship (Mark 10:17-27; 12:41-44). The Word and Work 21 (May 1928): 126-128.
      First Lord's Day Lesson of May. Lesson 6. May 6, 1928. Greatness through Service (Mark 10:35-45). The Word and Work 21 (May 1928): 153-154.
      Second Lord's Day Lesson of May. Lesson 7. May 13, 1928. Jesus Enters Jerusalem (Mark 11:1-10, 15-18). The Word and Work 21 (May 1928): 154-156.
      Third Lord's Day Lesson of May. Lesson 8. May 20, 1928. Jesus Teaching in the Temple (Mark 12:13-17, 28-34). The Word and Work 21 (May 1928): 156-158.
      Fourth Lord's Day Lesson of May. Lesson 9. May 27, 1928. The Wicked Husbandmen (Mark 12:1-12). The Word and Work 21 (June 1928): 158-160.
      First Lord's Day Lesson of June. Lesson 10. June 3, 1928. Jesus Facing Betrayal and Death (Mark 14:17-25, 32-36). The Word and Work 21 (June 1928): 185-187.
      Second Lord's Day Lesson of June. Lesson 11. June 10, 1928. The Arrest and Trial (Mark 15:1-15). The Word and Work 21 (June 1928): 187-188.
      Third Lord's Day Lesson of June. Lesson 12. June 17, 1928. The Crucifixion (Mark 15:22-26, 33-39). The Word and Work 21 (June 1928): 189-190.
      Fourth Lord's Day Lesson of June. Lesson 13. June 24, 1928. Jesus the Savior (Review). The Word and Work 21 (June 1928): 191.