A new discovery of hidden secrets in severall letters, propositions, articles, and other writings concerning the Earle of Newcastle, Captaine John Hotham, and many other malignant gentry of the northerne counties. All lately found in Pomfract Castle; the originals whereof remaine now in Yorke, where they may be seene of any who desire it. With a declaration of the Committee of Yorkshire, and some observations thereupon to undeceive their deluded and oppressed countreymen