1. Overdrilling of pastures and crops;Blackmore;N. Z. Jl Agric.,1958
2. Stand establishment and growth of corn on chemically killed sod as influenced by type of sod planter and speed of operation;Andrews,1969
3. Machinery development for direct drilling;Koronka;Outl. Agric.,1973
4. Performance of two experimental planters for nontillage corn culture;Triplett;Agron. J.,1963
5. Minimum cultivations—some likely developments in mechanization;Evans;N.A.A.S. q. Rev.,1964