Gilbert, J. H. 1889. Results of experiments at Rothamsted, the growth of leguminous crops, for many years in succession on the same land; being (with additions) a lecture delivered November, 1, 1889, at the Royal Agricultural College, Cirencester. Agricultural Students Gazette. 4 New Series (parts 5 and 6), p. 60pp. https://doi.org/10.5962/bhl.title.17969
Gilbert, J. H. 1888. Results of experiments at Rothamsted on the growth of potatoes for twelve years in succession on the same land. Lecture delivered 27 July 1888 at the Royal Agricultural College Cirencester. Agricultural Students Gazette. 4 New Series (2), pp. 1-80.
Gilbert, J. H. 1887. Results of experiments at Rothamsted on the growth of root crops for many years in succession on the same land. Lecture delivered 27 July 1887 at the Royal Agricultural College, Cirencester. Agricultural Students Gazette. 3 New Series (5), p. 50pp.
Gilbert, J. H. and Lawes, J. B. 1886. Results of experiments at Rothamsted on the growth of barley for more than thirty years in succession on the same land : lecture delivered June 29 1886 at the Royal Agricultural College Cirencester. Agricultural Students Gazette. 3 (New Series) (1), pp. 1-29.