Koziol, Martin. <br/><br/>
The maars of the Vulkan Eifel :  and how they were formed / 
Koziol, Martin. 
 -  Natur-und Geopark Vulkaneife,  2015. 
 - 51p.; 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Eruption