491. Lectures: 1926-27.
492. Lectures: 1928-30.
493. Lectures: 1928-38.
494. Lectures: 1930.
495. Lectures: 1932.
496. Lectures: 1936-40.
497. Lectures: 1937.
498. Lectures: 1940.
499. Lectures: 1940-41.
500. Lectures: 1940-41.
501. Lectures: 1940-41.
502. Lectures: 1941.
503. Lectures: 1941.
504. Lectures: 1941-42.
505. Lectures: 1947-48.
506. Lectures: 1948-53.
507. Lectures: 1949-54 and undated.
508. Lectures, Akron, OH: 1931.
509. Lectures, Alabama: 1931.
510. Lectures, Alton, IL: 1928.
511. Lectures, Amarillo, TX: 1931.
512. Lectures, Ann Arbor, MI: 1927.
513. Lectures, Ardmore, PA: 1927.
514. Lectures, Arkansas: 1931.
515. Lectures, Bar Harbor, ME: 1931.
516. Lectures, Battle Creek, MI: 1928.
517. Lectures, Boston, MA: 1928.
518. Lectures, Bristol, CT: 1927.
519. Lectures, Brooklyn, NY: 1927.
520. Lectures, Chautauqua Institution, Chautauqua, NY: 1931.
521. Lectures, Cincinnati, OH: 1927.
522. Lectures, Cleveland, OH: 1927.
523. Lectures, Concord, NH: 1927.
524. Lectures, Dallas, TX: 1928.
525. Lectures, Dallas, TX: 1931.
526. Lectures, Detroit, MI: 1928.
527. Lectures, Durham, NH: 1927.
528. Lectures, East Orange, NJ: 1927.
529. Lectures, El Paso, TX: 1931.
530. Lectures, Elizabeth, NJ: 1928.
531. Lectures, Emaus, PA: 1928.
532. Lectures, Evansville, IN: 1928.
533. Lectures, Flint, MI: 1928.
534. Lectures, Florida: 1931.
535. Lectures, Flushing, NY: 1928.
536. Lectures, Fort Worth, TX: 1931.
537. Lectures, Fresno, CA: 1931.
538. Lectures, Georgia: 1931.
539. Lectures, Houston, TX: 1928.
540. Lectures, Houston, TX: 1931.
541. Lectures, Illinois: 1931.
542. Lectures, Indiana: 1931.
543. Lectures, Indianapolis, IN: 1927.
544. Lectures, Indianapolis, IN: 1928.
545. Lectures, Iowa: 1931.