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reasonably inspect Lessee's books and records, that Lessee shall pay before delinquency, all taxes levied during the life of this lease upon the leased premises and upon any improvements thereon, or will reimburse Lessor for any such sums paid by Lessor. Leased area shall be used only for exploring, drilling and operating for oil and gas within area two hundred (200) feet or more below subsurface of area as indicated, in event leased area is not used for such purposes for continuous period of thirty (39) days, or Lessee uses leased area for any other pur­pose, such use or non use shall be conclusive evidence of abandonment and Lessor may enter and retake possession of leased area; nothing contained in lease shall modify or alter duties of Lessee with respect to mineral exception and reservation contained In deed by which Lessor acquired said land, dated April 13, 1967, recorded April 19, 1967 in Book b-3617, page 871, Official Records of Los Angeles County, California, except with respect to the right of entry on leased area to place oil and gas drilling equip­ment and appurtenances, and that drilling will be through the upper two hundred (200) feet of the land in accordance with gen­erally accepted drilling principles; Lessee agrees to indemnify and hold harmless the Lessor and its property from and against any and all liens, claims, demands, costs, and expenses in any way connected with work done, labor performed or materials furnished, and Lessee indemnifies and holds harmless Lessor