What are some crops grown in Liberia, and name two major rubber exporting companies there?

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4.
Some of the crops farmers grow in Liberia include rice, cassava, palm oil, coffee, cocoa, and rubber.

$$\boxed{\text{Rice, cassava, palm oil, coffee, cocoa, rubber}}$$

5.
Two major rubber companies in Liberia that export rubber are Firestone Natural Rubber Company and Guthrie Corporation.

$$\boxed{\text{Firestone Natural Rubber Company and Guthrie Corporation}}$$