1.
Report on the Kegalla District of the Province of Sabaragamuwa
2.
Letter from Prof. Z. K. Matthews to Dr. H. P. Van Dusen
Notes and Queries - volume 3 - Page 396
Notes and Queries - volume 12, 2nd Series - Page 455
Notes and Queries - volume 4, 2nd Series - Page 90
Meteorological observations during MAGDALENA cruise from Nederland to Batavia started at 1851-12-04
Meteorological observations during AZIA cruise from Batavia to the Netherlands started at 1852-02-16
Meteorological observations during AZIA cruise from Nederland to Batavia started at 1851-08-18