The ancient and present state of the navigation of the towns of Lyn, Wisbeach, Spalding, and Boston [electronic resource] : Of the rivers that pass through those places, and the countries that border thereupon, truly, faithfully, and impartially represented. And humbly proposed to the consideration of the inhabitants of those places and countries. With a way laid down how to remedy all the inconveniencies and defects which they now labour under