The Russian entry to the Northwest Coast was slow , however , due to a shortage of ships and sailors .
The Russians , therefore , advanced to the Northwest Coast only after the superior varieties of sea otters were depleted , around 1788 .
The Russians entry to the Northwest Coast was slow , however , due to a shortage of ships and sailors .
The Russians , therefore , advanced to the Northwest Coast only after the superior varieties of sea otters were depleted , around 1788 .