WEEKS.] 
PETROLOGY, AND MINERALOGY FOR 1892-1900. 
Economic geology — Continued. 
Products described— Continued. 
Clay, Jones, 2931. 
Clay, Keith, 2960, 2963. 
Clay, Kennedy, 3027, 3028. 
Clay, Keyes, 3074, 3075, 3088, 3116. 
Clay, Knight, 3209. 
Clay, Ladd, 3302, 3303. 
Clay, Lee, 3437. 
Clay, Leonard, 3464. 
Clay, Lincoln, 3512. 
Clay, Lonsdale, 3567. 
Clay, Marbut, 3646, 3647, 3648, 3649, 3660. 
Clay, McCalley, 3815. 
Clay, Merrill, 3930. 
Clay, Nason, 4059, 4060. 
Clay, Norton, 4118, 4124. 
Clay, Orton, 4163,4173. 
Clay, Ries, 4608,4614, 4622, 4623, 4625, 4626, 4632, 
4635, 4637a, 4638a. 
Clay, Shaler, Woodworth, and Marbut, 4930. 
Clay, Shephard, 4946. 
Clay, Siebenthal, 4961. 
Clay, Smith, 5017, 5019. 
Clay, Tilton, 5392. 
Clay, Todd, 5429. 
Clay, Watts, 5895. 
Clay, Wheeler, 6029, 6040. 
Clay, Whittle, 6123. 
Clay, Wilder, 6140. 
Clay, Youtz, 6536. 
Coal, Althouse, 78. 
Coal, Ashley, 127, 128. 
Coal, Babcock, 138. 
Coal, Bache, 139. 
Coal, Bain, 167, 169, 171, 172, 176, 181, 186, 192, 
193, 195, 196, 203, 205, 208. 
Coal, Beyer, 432, 436. 
Coal, Blake, 474. 
Coal, Bolton, 504. 
Coal, Boyd, 515. 
Coal, Branner, 526. 
Coal, Brewer, 557. 
Coal, Brown, 630. 
Coal, Campbell, 722, 723, 724, 729, 735, 737, 739, 
740, 741. 
Coal, Campbell and Leverett, 742. 
Coal, Campbell and Mendenhall, 732. 
Coal, Clark, O'Harra, Rowe, and Ries, 920. 
Coal, Crane, 1137. 
Coal, Crawford, 1144, 1145. 
Coal, Dall, 1268. 
Coal, Darton and Taff, 1318. 
Coal, Davis, F., 1345. 
Coal, Dawson, 1422, 1429, 1431. 
Coal, Day, 1467. 
Coal, Diller, 1503, 1508, 1509. 
Coal, D'Invilliers, 1515. 
Coal, Drake, 1539. 
Coal, Dumble, 1558, 1572, 1574. 
Coal, Eldridge, 1623, 1624, 1625, 1629, 1632. 
Coal, Eldridge and Muldrow, 1631. 
Coal, Emmons, 1713. 
Coal, Emmons, Cross, and Eldridge, 1707. 
Coal, Fairbanks, 1734, 1759. 
Coal, Fletcher, 1827, 1828. 
Coal, Forrester, 1874. 
Economic geology— Continued. 
Products described— Continued. 
Coal, Forstall, 1875. 
Coal, Gibson, 1977, 1979. 
Coal, Gilpin, 2026, 2028. 
Coal, Gorby, 2059. 
Coal, Gordon, 2063, 2065. 
Coal, Gresley, 2178, 2182. 
Coal, Hardt, 2289. 
Coal, Haworth, 2354, 2355, 2361, 2376. 
Coal, Hay, 2393, 2397. 
Coal, Hayes, 2410, 2411, 2412, 2413, 2417, 2419, 
2420, 2422. 
Coal, Head, 2440. 
Coal, Hills, 2594, 2598, 2599. 
Coal, Hodge, 2654. 
Coal, Hoffman, 2657. 
Coal, Holmes, 2716. 
Coal, Horsewill, 2758. 
Coal, Hosea, 2759. 
Coal, Iddings and Weed, 2831. 
Coal, Jones, 2925. 
Coal, Keith, 2961, 2963, 2965. 
Coal, Kemp, 2974. 
Coal, Kennedy, 3030. 
Coal, Keyes, 3045, 3059, 3063, 3074, 3075, 3139, 
3158. 
Coal, Kimball, 3161. 
Coal, Knerr, 3200. 
Coal, Knight, 3202. 
Coal, Lakes, 3336, 3351. 
Coal, Lane, 3388, 3399. 
Coal, Langdon, 3402. 
Coal, Leckie, 3426. 
Coal, Lee, 3437. 
Coal, Leonard, 3464. 
Coal, Lesley, D'Invilliers, and Smith, 3468. 
Coal, Lindgren, 3540. 
Coal, Lindgren and Turner, 3527. 
Coal, Lonsdale, 3567. 
Coal, Macfarlane, 3626. 
Coal, Marbut, 3646, 3647, 3648, 3649, 3650. 
Coal, McCalley, 3815, 3818, 3820b. 
Coal, McCreath and D'Invilliers. 3843. 
Coal, Meade, 3892. 
Coal, Mendenhall, 3903, 3904, 3905. 
Coal, Norton, 4124. 
Coal, Noyes, 4125. 
Coal, Orton, 4161. 
Coal, Page, 4238. 
Coal, Peale, 4267. 
Coal, Penhallow, 4331. 
Coal, Phillips, 4372. 
Coal, Poole, 4414. 
Coal, Purington, 4512. 
Coal, Ramsay, 4547. 
Coal, Roy, 4679, 4680. 
Coal, Russell, 4721. 
Coal, Safford, 4728. 
Coal, Schmitz, 4823. 
Coal, Scovell, 4886. 
Coal, Shaler and Woodworth, 4939. 
Coal, Shaler, Woodworth, and Foerste, 4940. 
Coal, Shephard, 4946. 
Coal, Sims, 4985. 
Coal, Smith, 5005. 
Coal, Spencer, 5124. 
