Determination of the EAS Attenuation Length from Data of the ANI   Experiment
  Using the EAS size spectra measured with the MAKET ANI array on Mt. Aragats, Armenia (3200m a.s.l.) in the range of the shower size 10^5 - 10^7 for different angles-of-incidence, the EAS attenuation length has been determined applying different analysis methods. The analysis is based on a data sample of 2.5*10^6 events collected in the period of June, 97 - April, 99. The results are compared with results deduced from data of the EAS TOP and KASCADE experiments. 
A.A. Chilingarian, G.V. Gharagyozyan, S.S. Ghazaryan, G.G. Hovsepyan,   E.A. Mamidjanyan, L.G. Melkumyan, S.H. Sokhoyan