Other useful resources on web

UCLA:
iPLEX: UCLA's institute for Planets and Exoplanets
Department of Earth and Space Sciences
Division of Astronomy and Astrophysics

Caltech:
Division of Geologic and Planetary Sciences

Spacecraft missions:
Mariner 10
MESSENGER
BepiColombo

Research centers:
NASA Jet Propulsion Labs
NASA Goddard Space Flight Center

Mercury information:
National Space Science Data Center
The Nine Planets