Here are some relevant subject headings to search in the Tripod catalog:
Antitrust law
Barriers to entry (industrial organization)
Big business
Cartels
Competition
Consumer protection
Corporations -- corrupt practices
[Geographic area] -- Economic policy
Free trade
Industrial concentration
Industrial organization
Industrial policies
Industries -- [Geographic area]
Markets [or various industry names] -- Law and Legislation
[various industries] -- Mergers
Monopolies
Monopolistic competition
Oligopolies
Price discrimination
Restraint of Trade
Trade regulation
Trusts, industrial
add "-- [your Geographic area of interest]" to any of the above subject headings to look for results specific to your area of interest.
Handbooks focused on particular industries can be useful for understanding environmental impacts and industrial regulation. Some examples: