Green-Reading Material Resources New limitations on the use of green-reading materials took effect on Jan. 1, 2019, coinciding with golf's new Rules. (USGA/Darren Carroll) How-To-Use Infographic A short, illustrated explanation in just 4 steps to let you determine how and when the new limitations on green-reading materials apply. Frequently Asked Questions Answers in simple language to the most common questions related to green-reading materials. Text of Interpretation 4.3a/1 Click here to read the text of Interpretation 4.3a/1 relating to the use of green-reading materials. Press Release - October 14, 2018 Read the text of the original press release from October 2018 announcing the limits to green-reading materials.