Agriculture: contributions to the surveys and planning reports prepared by Max Lock Group [Nigeria] for the North East State Government, Nigeria [limited circulation] (1976)
Other
Porter, G. (1976). Agriculture: contributions to the surveys and planning reports prepared by Max Lock Group [Nigeria] for the North East State Government, Nigeria [limited circulation]

Forestry: contributions to the surveys and planning reports prepared by Max Lock Group [Nigeria] for the North East State Government, Nigeria [limited circulation] (1976)
Other
Porter, G. (1976). Forestry: contributions to the surveys and planning reports prepared by Max Lock Group [Nigeria] for the North East State Government, Nigeria [limited circulation]

Fuel supply: contributions to the surveys and planning reports prepared by Max Lock Group [Nigeria] for the North East State Government, Nigeria [limited circulation] (1976)
Other
Porter, G. (1976). Fuel supply: contributions to the surveys and planning reports prepared by Max Lock Group [Nigeria] for the North East State Government, Nigeria [limited circulation]