| Quantitative seismology K Aki, PG Richards Quantitative seismology, 2002 | 20841 | 2002 |
| The tropical rain forest. PW Richards | 5965 | 1952 |
| Indigenous agricultural revolution: ecology and food production in West Africa P Richards Routledge, 2023 | 2645 | 2023 |
| Seismological evidence for differential rotation of the Earth's inner core X Song, PG Richards Nature 382 (6588), 221-224, 1996 | 652 | 1996 |
| Coping with hunger: hazard and experiment in an African rice-farming system P Richards Routledge, 1986 | 645 | 1986 |
| Quantitative Seismology. Sausalito K Aki, PG Richards Calif: University Science Books, 2002 | 394 | 2002 |
| The apparent attenuation of a scattering medium PG Richards, W Menke Bulletin of the Seismological Society of America 73 (4), 1005-1021, 1983 | 332 | 1983 |
| The Longman dictionary of law LB Curzon, P Richards Pearson Education, 2007 | 322 | 2007 |
| Quantitative seismology: Theory and methods K Aid, PG Richards San Francisco, 1980 | 319 | 1980 |
| Agriculture as a performance P Richards Farmer first: Farmer innovation and agricultural research 3943, 1989 | 278 | 1989 |
| Scattering of elastic waves from depth-dependent inhomogeneities PG Richards, CW Frasier Geophysics 41 (3), 441-458, 1976 | 232 | 1976 |
| Quantitative seismology (2 volumes) K Aki, PG Richards Freeman and Co. New York, 1980 | 231 | 1980 |
| Repeating seismic events in China DP Schaff, PG Richards Science 303 (5661), 1176-1178, 2004 | 229 | 2004 |
| Adopters, testers or pseudo-adopters? Dynamics of the use of improved tree fallows by farmers in western Kenya E Kiptot, P Hebinck, S Franzel, P Richards Agricultural systems 94 (2), 509-519, 2007 | 218 | 2007 |
| Inner core differential motion confirmed by earthquake waveform doublets J Zhang, X Song, Y Li, PG Richards, X Sun, F Waldhauser Science 309 (5739), 1357-1360, 2005 | 206 | 2005 |
| Sharing seed and knowledge: farmer to farmer dissemination of agroforestry technologies in western Kenya E Kiptot, S Franzel, P Hebinck, P Richards Agroforestry systems 68, 167-179, 2006 | 200 | 2006 |
| Pulse distortion and Hilbert transformation in multiply reflected and refracted body waves GL Choy, PG Richards Bulletin of the Seismological Society of America 65 (1), 55-70, 1975 | 168 | 1975 |
| Spatial and temporal variations in ts/tp and in P wave residuals at Blue Mountain Lake, New York: Application to earthquake prediction YP Aggarwal, LR Sykes, DW Simpson, PG Richards Journal of Geophysical Research 80 (5), 718-732, 1975 | 156 | 1975 |
| Seismic waves reflected from velocity gradient anomalies within the Earth's upper mantle PG Richards | 152 | 1972 |
| Quantative seismology: Theory and methods K Aki, PG Richards Quantative Seismology: Theory and Methods. by K. Aki and PG Richards. San …, 1980 | 144 | 1980 |
