Windows in the earth:  and other wonders of nature/  -- Columbus, Ohio:  Zaner-Bloser, Inc.,  1990. <br/> col.: ill.;  29. <br/><br/><label>ISBN: </label>0883095332 <br/><br/><label>Subjects--Topical Terms: </label><br/>Earth<br/>Nature<br/><br/><label>Dewey Class. No.: </label>HS Cir 550 W722 1990