00302nam a2200097Ia 4500008004100000082003100041100002600072245006000098260003800158300000800196140113s9999 xx 000 0 und d a631.631.461:311.213.2 L1 a"Parkinson, D., Etc." aMethods of studying the ecology of soil micro-organisms a1971bBlackwell Sci. Pub.cOxford a116