Helwing, Georg Andreas: M. Georgii Andreae Helwings ... Lithographia Angerburgica, sive lapidum et fossilium, in districtu Agerburgensi & ejus vicinia, ad trium vel quatuor milliarium [...] : in montibus, agris, arenofodinis & in primis circa lacuum littora & fluviorum ripas, collectorum brevis & succincta consideratio ... Regiomonti [Königsberg] : literis Iohannis Stelteri 1717