- Reserves of Niobium in Nigeria in 2001Jan 15, 2002
- Reserves of Niobium in Nigeria in 2000Jan 15, 2001
- Reserves of Niobium in Nigeria in 1999Jan 15, 2000
- Reserves of Niobium in Nigeria in 1998Jan 15, 1999
- Reserves of Niobium in Nigeria in 1997Jan 15, 1998
- Reserves of Niobium in Nigeria in 1996Jan 15, 1997
- Reserves of Niobium in Nigeria in 1995Jan 15, 1996