Baltic Ship-Master's Assistant, and Owner's Calculator : containing an account of the course of exchange, weights and measures, in the principal ports in the Baltic; Tables, shewing any number of deals reduced to Standard Deals, in the ports of Russia, Sweden, Prussia, and Norway; with tables shewing the loads, feet, and inches contained in any quantity of Dantzic deal, plank, &c. and for freight of ships, with deals, timber, tar, &c.