Andrew Vik
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Aydin:

Here are the only references I can find for Solem from the 1950's:

1953. Marine and fresh-water mollusks of the Solomon Islands.
    Fieldiana Zoology 34:213-227.

1954(12/31). Living species of the pelecypod family Trapeziidae.
    Proceedings of the Malacological Society of London
    31(2):64-87, 4 fgs., pls. 5-7.

1957. Philippine snails of the family Endodontidae.
    Fieldiana Zoology 41(1):1-12, 4 fgs.

1958(10/17). Marine mollusks from Bougainville and Florida,
    Solomon Islands. Fieldiana Zoology 39(20):213-226.

1958. Endodontide Landschnecken von Indonesien und Neu Guinea.
    Archiv fur Molluskenkunde 87(1-3):19-26, 6 fgs.

1959(10/15). Systematics and zoogeography of the land and fresh-water
    Mollusca of the New Hebrides. Fieldiana Zoology 41:1-359,
    34 pls., 38 fgs., 18 tbls. [? vol. 43(1)].

1959(12/21). On the family position of some Palau, New Guinea,
    and Queensland land snails. Archiv fur Molluskenkunde 88(4-
    6):151-158, pls.12-13, 2 fgs.

Seems that he wrote predominantly for Fieldiana Zoology in that decade,
but I can't find anything definite.

Yours, Andrew V.