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Johnson, 377.
Johnson, Alex. S., 264.
Johnson, George, 285.
Johnson, W. C., 244, 251.
Johnson, W. R., 259, 263.
Johnston, A. Keith, 373.
Johnston, Christopher, 81, 269, 270,
279.
Judacis, Cornelio, 333.
Juniata formation, 180.
Junken, C., 121.
Jurassic, 190.
K.
K., J. C., 284.
Kearney, J., 372.
Keith, A., 103, 104.
Keith, Arthur, 18, 310, 314, 323, 393,
398.
Kelly, Thos. C., 292.
Kemp, James F., 326.
Kent, Wm., 314.
Kerr, J. Bozman, 252.
Kettlewell, S. H., 378, 387.
Key, Sothoron, 324.
Keyes, Chas. E., 88, 89, 101, 307, 310,
319, 326, 329, 399.
Keyser, E. Brent, 50, 319.
Keyser, Wm., 50, 319.
Kinnecutt, L. P., 310.
Kitchin, T., 350, 353.
Kling, Mons., 334.
Klittke, M., 330.
Klockhoff, H., 360.
Knight, Jonathan, 261, 366.
Knowlton, F. H., 110, 301, 304, 330.
Kunz, G. F., 295, 307.
L.
Lafayette formation, 198.
Laing, John, 390.
Lake, Griffing and Stevenson, 383,
384.
Land Office, 382.
Latrobe, B. H., 53, 236, 278, 365, 369,
370.
Lattrg, 355.
Lea, Henry C., 262.
Lea, I., 64, 246.
Lea, Philip, 360.
Lead, 227.
Leconte, Jas., 288.
Lee, Thos. J., 269.
Leidy, J., 80, 272, 275, 285.
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Le Eouge, Geo. L., 353.
Lesley, J. P., 81, 82, 267, 278, 282,
284, 289, 314.
Lewis, H. C., 281, 286.
Lewis, Samuel, 358, 359, 361.
Lewis, Thomas, 345.
Lewistown formation, 182.
Lime and cement products, 33, 214.
Lindenkohl, A., 310, 394.
Livermore, 242.
Lloyd, J. T., 375.
Locke, Jno., 261, 264.
Lodge, Jno., 352, 354.
Logan, Wm. E., 275, 371, 377, 378.
Lonsdale, W., 260.
Loomis, Elias, 253, 255, 257, 261, 368.
Letter, Matthieu Albert, 357.
Loudoun formation, 176.
Louis, Henry, 330.
Lowdermilk, Will H., 282.
Lucas, Fielding, Jr., 57, 363, 364, 365,
367, 370, 373.
Luillier, J., 343.
Luke, J. D., 380.
Lyell, Charles, 66, 67, 260, 369, 371.
M.
Macfarlane, James, 277, 279, 307,
380, 387.
Mackubin, Geo., 253.
Maclure, Wm., 53, 54, 236, 237, 362,
363, 373.
Magnetic conditions, determination
of, 29.
Magnetic declination, 407.
Magnetic declination in Maryland,
distribution of, 486.
Magnetic declination, variations of,
453.
Magnetic force of the earth, in-
tensity of, 418.
Magnetic inclination, 413.
Magnetic Observatory, Toronto,
406, 462.
Magnetic Observatory, Washington,
406, 435, 446, 447, 454, 455, 457.
Magnetic stations in Maryland, de-
scriptions of, 498.
Magnetic survey of Maryland, gen-
eral account of, 432.
Magnetic surveys, development and
purposes of, 407.
Magnetic surveys, elements in-
volved in, 421.
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