1. (a) The quantity of skim milk and butterfat contained in:

   1. (1) receipts of milk from producers;
   2. (2) receipts of fluid milk products from other pool plants or partial pool plants and from pool units or partial pool units; and
   3. (3) receipts of other source milk.
2. (b) Inventories at the beginning and the end of each month of fluid milk products and products specified in section 20.41(c)(1) of this Part.
3. (c) The utilization of all skim milk and butterfat required to be reported pursuant to this section, including the destination of any fluid milk product, the classification of which wholly or partially depends upon its destination.
4. (d) The computation pursuant to section 20.60 of this Part of such handler's net pool obligation.

Each handler, except a handler receiving own farm milk and not required to be listed pursuant either to section 20.11 or 20.12 of this Part, shall report each month to the market administrator for the preceding month in the manner and on the forms prescribed by the market administrator with respect to each pool plant, partial pool plant, pool unit or partial pool unit operated by such person, the information set forth in subdivisions (a) through (d) of this section. Such report, shall be physically received at the office of the market administrator no later than the close of business on the 10th day of the month. Other information required to be reported no later than the 10th day of the month pursuant to sections 20.25 and 20.31 of this Part must also be physically received by the market administrator no later than the 10th day of the month.