Salter, Robert M, <br/><br/>
Trans-planetary subway systems : a burgeoning capability / 
Robert M. Salter   
 - 35 pages ;  28 cm. 
 - The Rand paper series;  P-6092 .
 - The Rand paper series;  P-6092  .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Subways--United States  <br/>High speed ground transportation--United States