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Six in-depth cultural tours to china are being offered by Tiller International Travel this year. Visits to the world's great artistic and religious monuments in recently opened Dunhuang and Yungang, and capital cities of Tibet, Inner Mongolia, and Chinese Central Asia, as well as the garden city of Suzhou in the Yangtze Valley, are the features of these 21- to 24-day tours.

Also included are the popular cities of Peking, Xian, Shanghai, and Hong Kong. A unique railroad journey between the spectacularly scenic Sichuan and Guilin in southwest China is among the tour programs.

All departures are limited to 15 participants. Each group is accompanied by an experienced and knowledgeable Chinese- and English-speaking tour director. Land cost is between $2,300 to $3,000 per person, sharing a twin bedded room. For brochures, contact Tiller International Travel, 209 Post Street, Suite 1015, San Francisco, Calif. 94108; telephone (415) 397-1966.