The use of machinery in cutting corn von Tolley, H. R.

Data response exercises in physical and human geography von Briggs, K., Riley, Denis, Tolley, H.

Research into the curriculum von Bastiani, John, Tolley, H.

Yorkshire and North Lincolnshire von Tolley, H., Orrell, K.

Yorkshire and North Lincolnshire von Tolley, H., Orrell, K.

Shall I buy a tractor? (for a corn-belt farm) von Reynoldson, L. A., Tolley, H. R.

Better use of man labor on the farm a few suggestions for increasing man power by using bigger teams and more machines von Tolley, H. R., Yerkes, Arnold P.

Statistical applications using fuzzy sets von Manton, Kenneth G. 1947-, Woodbury, Max A., Tolley, H. D.

Choosing a tractor (for a corn-belt farm) von Reynoldson, L. A., Tolley, H. R.

Motor trucks on eastern farms von Tolley, H. R.

Fire prevention and fire fighting on the farm von Tolley, H. R.

The efficient operation of thrashing machines von Tolley, H. R.