Pierik, Marie <br/><br/>
The spirit of Gregorian chant 
Marie Pierik. 
 - Boston  B. Humphries  c1939. 
 - 202 p.  ill., music  22 cm. 
<br/><br/> Errata slip inserted. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chants Plain, Gregorian, etc.