SALT LAKE CITY (AP) — Conservation and tribal groups are airing TV ads, sending letters to President Donald Trump and creating parody websites in a last-minute blitz to stop Interior Secretary Ryan Zinke from downsizing or eliminating national monument areas that cover large swaths of land and water from Maine to California.

The deadline for Zinke to announce his recommendations is Thursday following a four-month review of 27 sites ordered by President Donald Trump.

A tribal coalition that pushed for the Bears Ears National Monument in Utah, designated by President Barack Obama in December, unveiled a new webpage Tuesday that explains the cultural importance of lands considered sacred to them. They also posted a letter sent to President Trump telling him that part of “making American great again” is honoring tribal history and rights.

“Please hear our voices,” wrote Willie Grayeyes, chairman of the coalition. “These sacred lands have held our song, our stories, and our prayers since time beyond memory, and these lands will continue to hold the promise of our future.”

Zinke’s recommendations for the 27 national monument areas under review could eliminate some of them altogether or in some cases shrink them in size by opening them to commercial uses such as mining, grazing of livestock or oil drilling.

The outdoor recreation industry has hammered home its message that peeling back protections on areas where its customers hike, bike and camp could prevent future generations from enjoying the sites.

In addition, the Wilderness Society has created a parody website featuring Trump and Zinke selling luxury real estate at the lands.

Groups that want to see the areas reduced have been less vociferous, pleading their cases on social media and working behind the scenes to lobby federal officials.

They say past presidents have misused a century-old law to create monument areas that are too large and stop energy development, grazing, mining and other uses.

Stan Summers, a Utah county commissioner who chairs a group that advocates for the multi-use of public lands, said outdoor recreation companies are peddling lies and misconceptions when they say local officials want to bulldoze monument lands.