At a minimum, you will want to download all of the OLD-CISCO- and CISCO- mibs (including -TC and -SMI) for your network management workstation.
IOS 12.2 Support
Supported SNMP version 1 MIBs:
BRIDGE-MIB
ETHERLIKE-MIB
NOVELL-IPX-MIB
NOVELL-NLSP-MIB
NOVELL-RIPSAP-MIB
OLD-CISCO-CHASSIS-MIB
OLD-CISCO-CPU-MIB.my
OLD-CISCO-FLASH-MIB
OLD-CISCO-IP-MIB
OLD-CISCO-INTERFACES-MIB
OLD-CISCO-MEMORY-MIB
OLD-CISCO-NOVELL-MIB
OLD-CISCO-SYSTEM-MIB
OLD-CISCO-TCP-MIB
OLD-CISCO-TS-MIB
RFC1213-MIB
RFC1253-MIB
RFC1381-MIB
RFC1382-MIB
RMON-MIB
Supported SNMP version 2 MIBs:
ATM-MIB
BGP4-MIB
CISCO-AAL5-MIB
CISCO-ATM-EXT-MIB
CISCO-CAR-MIB
CISCO-CDP-MIB
CISCO-CONFIG-COPY-MIB
CISCO-CONFIG-MAN-MIB
CISCO-CIRCUIT-INTERFACE-MIB
CISCO-ENTITY-ASSET-MIB
CISCO-FLASH-MIB
CISCO-HSRP-EXT-MIB
CISCO-HSRP-MIB
CISCO-IETF-ATM2-PVCTRAP-MIB
CISCO-IMAGE-MIB
CISCO-IP-STAT-MIB
CISCO-IPMROUTE-MIB
CISCO-MEMORY-POOL-MIB
CISCO-NTP-MIB
CISCO-PING-MIB
CISCO-PROCESS-MIB
CISCO-QUEUE-MIB
CISCO-RTTMON-MIB
CISCO-SNAPSHOT-MIB
CISCO-STACKMAKER-MIB
CISCO-TCP-MIB
CISCO-VPDN-MGMT-MIB
ENTITY-MIB
HC-RMON-MIB
IF-MIB
IGMP-MIB
IPMROUTE-MIB
INT-SERV-GUARANTEED-MIB
INT-SERV-MIB
MSDP-MIB
PIM-MIB
RMON2-MIB
RS-232-MIB
RSVP-MIB
SMON-MIB
SNMPv2-MIB
TCP-MIB
UDP-MIB