s: 61

Rodopi (Rhodope) Mountains: 25, 39-40 _passim_, 55, 226, 227;
as boundary, 49;
mineral resources, 48, 257, 259;
Pomaks in, 67;
population density, 57

Romania: 26-27, 35, 172, 175, 176, 256, 287;
Balkan War--1913, 22-23;
border crossing, 50;
cooperative hydroelectric power complex, 176, 180, 255;
World War I, 24

Romanians: vii, 2, 55, 58, 65

Romans: 9-10, 11, 12, 54

Rositsa River: 42

Rumili (Rumelia): 16, 20

Ruse: 54, 115, 199, 232, 250;
railroads, 59, 60

Russia: 9, 17, 19, 22, 106, 172;
Revolution--1917, 24

Saint Sophia church: 54

Saint Theodor of Plateina: 131

Sakar mountains: 40

Samuel, King: 13

Scientific and Technical Union: 277

sculpture: 133

Serbia: 12, 15, 17, 22, 23, 28

settlement patterns: 52-55

shipbuilding: 62

Shumen: 199

Simeon, regency for: 28

size: vii, 37

Slaveikov, Pencho: 127

Slaveikov, Petko: 126

Slavs: 2, 9, 10, 11, 52

Sliven: 253

Slunchev Bryag: 196

smuggling: 273

Smyrnenski, Khristo: 127

social benefits: 89-91, 142

Social Democratic Party: 21, 30, 31, 32, 33, 159, 191

social system: 6, 65-77;
BKP membership, 6, 75;
Communists, effect of, 65, 69, 73-77;
feudal, 11;
party elite, 6, 73-74, 75;
peasants (_see also_ peasants), 6, 71,72, 74;
rural-urban differences, 71-73;
social mobility, 6, 7, 75-76;
traditional, 6, 65, 72-73, 76-77;
urban intelligentsia, 72, 73

Socialist patriotism: 189

Sofia: 40, 53-54, 250;
Academy of Fine Arts, 132;
administrative district, 50;
Bulgarian National Library, 199;
climate, 44, 53;
education in, 107, 115, 117;
Higher Institute of Construction and Engineering, 275;
hot springs, 48, 53-54;
industry, 259;
libraries, 199;
media administrative center, 187;
mineral resources, 47, 48;
Radio Sofia, 195;
television, 196;
theaters, 128, 129;
transportation, ix, 59, 60, 63;
Turkish period, 16, 17;
University of, 96, 97, 113, 135;
World War II, 28, 29

Sofia Basin: 38, 41, 227

soils: 44-45, 226-227

Soviet Union: Bulgarian students, 116;
Bulgarian timber workers, 260, 263;
electricity imports from, 256;
influence, 3, 9, 10, 29-30, 155;
relations, 153-154, 156, 162, 171, 172, 175, 296;
trade, viii, 175, 180, 222, 244, 257;
World War II, 27, 28-29, 30-31, 288

sports: 91

Sredna Gora: 38, 42, 45, 259