Ringwald, F. <br/><br/>
Use of electric light for the hot-house forcing of vegetables and early produce, and supplementary lighting of hen-houses to increase egg production. 

 - Geneva :  United Nations Economic Commission for Europe,  1955. 
 - United Nations. [Document] ;  E/ECE/215, E/ECE/EP/164 .
 - Document (United Nations) ;  E/ECE/215, E/ECE/EP/164 .
<br/><br/> At head of title: Rural electrification. 
<br/><br/><label>LCCN: </label>56002517 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electricity in agriculture.<br/>Greenhouse management.<br/>Poultry -- Housing.--Poultry -- Housing.