Management Information Base MIBVersion 1 MIB corresponds roughly to Version 1 SNMP, and is documented in RFC 1155. MIB-II, the most widely implemented MIB, is documented in RFC 1213. RFC 1902 discusses Version 2 MIB structure. IANA maintains a large MIB repository at ISI.
An address in "MIB space" is typically written like ip.ipForwarding.0.The Encyclopedia includes a very limited selection of MIBs:
SNMPv2 MIB(RFC 1907)
SNMPv2 Party MIB(RFC 1447)
Manager-to-Manager MIB(RFC 1451)
OSPF2 MIB(RFC 1850)
MIB-II (RFC 1213)