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1. Control of chronic respiratory disease I. The effects of chlortetracycline (CTC) and terephthalic acid (TPA).

2. Control of chronic respiratory disease II. The effect of low calcium diet, terephthalic acid and chlortetracycline.

3. Control of chronic respiratory disease. IV. The effect of a low-calcium diet and high concentrations of chlortetracycline of the isolation of Mycoplasma from experimentally infected chicks.

4. Control of chronic respiratory disease III. Isolation of mycoplasma as infleunced by potentiated chlortetracycline and time interval after exposure.