current notes on net-snmp MIBs

Go watch them online there:
http://www.net-snmp.org/docs/mibs/
Or simply snmptranslate through shell after installing snmp-tools:

# snmptranslate -Tp SNMPv2-MIB::snmpMIB

+--snmpMIB(1)
   |
   +--snmpMIBObjects(1)
   |  |
   |  +--snmpTrap(4)
   |  |  |
   |  |  +-- ---N ObjID     snmpTrapOID(1)
   |  |  +-- ---N ObjID     snmpTrapEnterprise(3)
   |  |
   |  +--snmpTraps(5)
   |  |  |
   |  |  +--coldStart(1)
   |  |  +--warmStart(2)
   |  |  +--linkDown(3)
   |  |  +--linkUp(4)
   |  |  +--authenticationFailure(5)
   |  |
   |  +--snmpSet(6)
   |     |
   |     +-- -RW- INTEGER   snmpSetSerialNo(1)
   |              Textual Convention: TestAndIncr
   |              Range: 0..2147483647
   |
   +--snmpMIBConformance(2)
      |
      +--snmpMIBCompliances(1)
      |  |
      |  +--snmpBasicCompliance(2)
      |  +--snmpBasicComplianceRev2(3)
      |
      +--snmpMIBGroups(2)
         |
         +--snmpSetGroup(5)
         +--systemGroup(6)
         +--snmpBasicNotificationsGroup(7)
         +--snmpGroup(8)
         +--snmpCommunityGroup(9)
         +--snmpObsoleteGroup(10)
         +--snmpWarmStartNotificationGroup(11)
         +--snmpNotificationGroup(12)

http://www.net-snmp.org/wiki/index.php/TUT:Writing_a_MIB_Module