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https://stackoverflow.com/questions/23363333/how-do-i-change-the-css-of-only-one-page-in-wordpress

https://wordpress.stackexchange.com/questions/169371/if-is-custom-post-type-archive-page

https://developer.wordpress.org/reference/functions/is_page/


<?php 
if( is_post_type_archive('mg3_projects')  ) { ?>
    <link rel="stylesheet" type="text/css" href="<?php echo get_bloginfo('template_directory') . '/assets/css/normalize.css' ; ?>">       
    <link rel="stylesheet" type="text/css" href="<?php echo get_bloginfo('template_directory') . '/assets/css/layout.css' ; ?>">        
    <link rel="stylesheet" type="text/css" href="<?php echo get_bloginfo('template_directory') . '/assets/css/owl.carousel.min.css' ; ?>">   
    <link rel="stylesheet" type="text/css" href="<?php echo get_bloginfo('template_directory') . '/assets/css/owl.theme.default.min.css' ; ?>">  
<?php } ?>


<?php
if( is_page('about-us') )  {   ?>	
	<link rel="stylesheet" type="text/css" href="<?php echo get_bloginfo('template_directory') . '/assets/css/timeline.css' ; ?>"> 
<?php }  ?>