المؤلفون: Caprio, Joseph M.^Aff6, Hopp, Richard J.^Aff7, Williams, Jack S.^Aff6

المساهمون: Jacobs, J., editor^Aff1, Lange, O. L., editor^Aff2, Olson, J. S., editor^Aff3, Wieser, W., editor^Aff4, Lieth, Helmut, editor^Aff5

المصدر: Phenology and Seasonality Modeling. 8:77-82

Degree: Ph.D.

المؤلفون: Hopp, Richard J.^Aff6

المساهمون: Jacobs, J., editor^Aff1, Lange, O. L., editor^Aff2, Olson, J. S., editor^Aff3, Wieser, W., editor^Aff4, Lieth, Helmut, editor^Aff5

المصدر: Phenology and Seasonality Modeling. 8:25-43

Degree: Ph.D.

المؤلفون: Jesinger, Rolf, Hopp, Richard J.

المصدر: Arnoldia, 1967 Dec . 27(12), 85-90.

URL الوصول: https://www.jstor.org/stable/42953811

المؤلفون: Hopp, Richard J., Merrow, Susan B.

المصدر: Qualitas plantarum et materiae vegetabiles. March 1965 12(1):59-81

المؤلفون: Hopp, Richard J.^Aff6, Lieth, Helmut^Aff7

المساهمون: Jacobs, J., editor^Aff1, Lange, O. L., editor^Aff2, Olson, J. S., editor^Aff3, Wieser, W., editor^Aff4, Lieth, Helmut, editor^Aff5

المصدر: Phenology and Seasonality Modeling. 8:367-368

Degree: Ph.D.

المؤلفون: Hopp, Richard J.

المصدر: Obst und Gemüse im modernen Markt : München, pg. 55-64. 1964