Here is the manifest from that voyage (Souvenir Passenger List)
Departing Seattle WA 21 Sept. 1956 and arriving Yokohama 6 Oct.
氷川丸の旅客マニフェスト
The Crouches are listed on the bottom of the right hand page above.
The Hikawa-maru is moored as a museum in Yokohama.
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