Heart of oak, the British bulwark : shewing, I. reasons for paying greater attention to the propagation of oak timber ... II. the insufficiency of the present laws ... III. the testimony of some of the most eminent timber merchants, shipwrights, &c. ... IV. that the neglect of planting ...V. the author's opinion what methods would be most effectual ... humbly offered to His Majesty and the Parliament, as well as to all proprietors of land in Great-Britain /