59. A forest engineer who advertises may indicate a price or hourly rate for his services on the following conditions:(a) the price of hourly rate shall be specified;
(b) for each price, the nature and the scope of the services shall be specified;
(c) the advertisement shall specify whether the costs and expenses are included in the price;
(d) the price or hourly rate shall remain in force for a period of at least 60 days following the last publication thereof.