Frome, Michael. <br/><br/>
National park guide / 
Michael Frome. 
 - 21st ed. 
 - Chicago :  Rand McNally & Company,  1987. 
 - 245 p. :  ill. ;  28 cm. 
<br/><br/><label>ISBN: </label>0528845896 
<br/><br/><label>Subjects--Topical Terms: </label><br/>National parks and reserves--United States.