According to Official Guinness Records,
The largest collection of miniature books consists of 3,137 unique books and belongs to Sathar Adhoor (India), The collection was verified in Thrissur, India, on 4 June 2016.A miniature book is a very small book, no larger than 7.5 cm (3 in) in height, width or thickness.
For a complete list of 2016 records, please visit 2016 Guinness Records in India.