| Classes of inventories |
| | | | | | | | | | | | | | | | | | | (in thousands) | September 30,
2022 | | December 31,
2021 | | September 30,
2021 | | Grain and other agricultural products (a) | $ | 1,198,790 | | | $ | 1,427,708 | | | $ | 732,512 | | | Propane and frac sand (a) | 25,797 | | | 23,780 | | | 18,481 | | | Ethanol and co-products (a) | 117,310 | | | 184,354 | | | 105,052 | | | Plant nutrients and cob products | 214,529 | | | 178,696 | | | 161,759 | | | Total inventories | $ | 1,556,426 | | | $ | 1,814,538 | | | $ | 1,017,804 | |
(a) Includes RMI of $1,167.0 million, $1,410.9 million and $700.3 million at September 30, 2022, December 31, 2021 and September 30, 2021, respectively.
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