By Herfarth, H., Feagan, B.G., Fölsch, U.R., Schölmerich, J., Vatn, M.H., Zeitz, M.
By Gans, Roma, Keller, H.
By Winstone, H.
By Gütlich, P., Fitzsimmons, B.W., Ruffer, R., Spiering, H.
By Oria, M., Raffin, J., Perry, G.A., Barnes, H.
By Ibach, H., Lueth
By Tanner, James M., Healy, Michael J. R., Goldstein, H., Cameron, N.
By Foote, H., Keys, J.
By Branley, Franklyn M., Keller, H.
By van der Goot, H.
By Bolwell, L. H., H., L.
By Tate, Joan, Leetham, H.
By Wolfflin, Heinrich, Grieve, A., H.
By Innis, H.
By Marr, H., Giebing
By M. M. Brem, Bremmer, H.
By Wylie, William Derek, Churchill-Davidson, H.C., H.
By Eggers, Reinhold, Gee, H.
By Zola, Émile, Ellis, H.
By Miller, Alice, Hannum, H.
By Myint, H.
By Ross, Prof. Alistair, Fulford, J, Hutchings, Merryn, Schmitz, H., Bottomley, Jane
By Rybakov, Anatolii, Shukman, H.
By Belcher, H., Swale, E., Culture Collection of Algae and Protozoa
By Beck, A. H. W., Ahmed, H.
By Mendling, Werner, Rieth, H., Dora Wirth Languages Ltd.
By Jacobs, B., Hjalmarsson, H., Basbanes, Nicholas A.
By Ramsden, H.
By Mann, A., Rich, H.