Most popular books in 1937:
the seven most popular novels were

1. The Citadel
2. Gone With The Wind
3. The Count of Monte Cristo
4. The Stars Look Down
5. Busman’s Honeymoon
6. Lost Horizon
7. The Good Earth

the six most popular non-fiction works were:

1. Edward VIII
2. Gibbon’s Catalogue of Postage Stamps
3. Seven Pillars of Wisdom
4. Inside Europe
5. The Fool Hath Said
6. Catalogue of Postage Stamps