Planet of the Damned by Harry Harrison — Read

The guard inside the front entrance of the Foundation building jumped at the thunderous noise and reached for his gun. He dropped his hand sheepishly when he realized it was only a sneeze -- though a gargantuan one. Brion came up, sniffling, huddling down into his coat. "I'm going out before I catch pneumonia," he said. The guard saluted dumbly, and after checking his proximity detector screens he slipped out and the heavy portal thudded shut behind him. The street was still warm from the heat of the day and he sighed happily and opened his coat.

This was partly a reconnaissance trip -- and partly a way of getting warmed up. There was little else he could do in the building; the staff had long since retired. He had slept for a half an hour, and had waked refreshed and ready to work. All of the reports he could understand had been read and reread until they were memorized. He could use the time now, while the rest of them were asleep, to get better acquainted with the main city of Dis.