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tion to servo Hyde Park and property In the area of Hyde Park) as the same exists as of September 1, 1952. In the event any additions and betterments were under construction, but had not been compos ted as of that date, you will bear the cost of such additions and betterments in so far as they existed as of September 1, 1952, and the District will bear the cost of said additions and betterments subsequent to September 1, 1952. It is understood that additions and betterments under Rule 9 Contracts are excluded from the provision of this subsection ”3*. (e) You will encumber all lands owned by you (other than lands described in paragraph (a) above) in Sections 27# 20# 29# 30, 31, 32# S3 and 34, Township 20 South, Range 61 East M.D.B. & M (except such lands within such sections as lie within the boundaries of the shop grounds as hereinafter defined) for a term of fifty (SO) years with a eove- 5