diff --git a/Gemfile.lock.old b/Gemfile.lock.old
new file mode 100644
index 0000000..bc9968a
--- /dev/null
+++ b/Gemfile.lock.old
@@ -0,0 +1,77 @@
+GEM
+ remote: https://rubygems.org/
+ specs:
+ addressable (2.6.0)
+ public_suffix (>= 2.0.2, < 4.0)
+ colorator (1.1.0)
+ concurrent-ruby (1.1.5)
+ em-websocket (0.5.1)
+ eventmachine (>= 0.12.9)
+ http_parser.rb (~> 0.6.0)
+ eventmachine (1.2.7)
+ ffi (1.11.1)
+ forwardable-extended (2.6.0)
+ http_parser.rb (0.6.0)
+ i18n (0.9.5)
+ concurrent-ruby (~> 1.0)
+ jekyll (3.8.5)
+ addressable (~> 2.4)
+ colorator (~> 1.0)
+ em-websocket (~> 0.5)
+ i18n (~> 0.7)
+ jekyll-sass-converter (~> 1.0)
+ jekyll-watch (~> 2.0)
+ kramdown (~> 1.14)
+ liquid (~> 4.0)
+ mercenary (~> 0.3.3)
+ pathutil (~> 0.9)
+ rouge (>= 1.7, < 4)
+ safe_yaml (~> 1.0)
+ jekyll-feed (0.12.1)
+ jekyll (>= 3.7, < 5.0)
+ jekyll-optional-front-matter (0.3.0)
+ jekyll (~> 3.0)
+ jekyll-sass-converter (1.5.2)
+ sass (~> 3.4)
+ jekyll-seo-tag (2.6.1)
+ jekyll (>= 3.3, < 5.0)
+ jekyll-watch (2.2.1)
+ listen (~> 3.0)
+ kramdown (1.17.0)
+ liquid (4.0.3)
+ listen (3.1.5)
+ rb-fsevent (~> 0.9, >= 0.9.4)
+ rb-inotify (~> 0.9, >= 0.9.7)
+ ruby_dep (~> 1.2)
+ mercenary (0.3.6)
+ minima (2.5.0)
+ jekyll (~> 3.5)
+ jekyll-feed (~> 0.9)
+ jekyll-seo-tag (~> 2.1)
+ pathutil (0.16.2)
+ forwardable-extended (~> 2.6)
+ public_suffix (3.1.0)
+ rb-fsevent (0.10.3)
+ rb-inotify (0.10.0)
+ ffi (~> 1.0)
+ rouge (3.4.1)
+ ruby_dep (1.5.0)
+ safe_yaml (1.0.5)
+ sass (3.7.4)
+ sass-listen (~> 4.0.0)
+ sass-listen (4.0.0)
+ rb-fsevent (~> 0.9, >= 0.9.4)
+ rb-inotify (~> 0.9, >= 0.9.7)
+
+PLATFORMS
+ ruby
+
+DEPENDENCIES
+ jekyll (~> 3.8.5)
+ jekyll-feed (~> 0.6)
+ jekyll-optional-front-matter
+ minima (~> 2.0)
+ tzinfo-data
+
+BUNDLED WITH
+ 2.0.2
diff --git a/Gemfile.old b/Gemfile.old
new file mode 100644
index 0000000..48514e5
--- /dev/null
+++ b/Gemfile.old
@@ -0,0 +1,34 @@
+source "https://rubygems.org"
+
+# Hello! This is where you manage which Jekyll version is used to run.
+# When you want to use a different version, change it below, save the
+# file and run `bundle install`. Run Jekyll with `bundle exec`, like so:
+#
+# bundle exec jekyll serve
+#
+# This will help ensure the proper Jekyll version is running.
+# Happy Jekylling!
+gem "jekyll", "~> 4.1.1"
+
+# This is the default theme for new Jekyll sites. You may change this to anything you like.
+gem "minima", "~> 2.5"
+
+# If you want to use GitHub Pages, remove the "gem "jekyll"" above and
+# uncomment the line below. To upgrade, run `bundle update github-pages`.
+# gem "github-pages", group: :jekyll_plugins
+
+# If you have any plugins, put them here!
+group :jekyll_plugins do
+## gbn: we're not using feeds (this creates feed.xml:
+## gem "jekyll-feed", "~> 0.6"
+end
+
+# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
+### gbn: not needed with a Linux system
+### gem "tzinfo-data", platforms: [:mingw, :mswin, :x64_mingw, :jruby]
+
+# Performance-booster for watching directories on Windows
+gem "wdm", "~> 0.1.0" if Gem.win_platform?
+
+### gbn customizations
+### gem 'jekyll-optional-front-matter' # https://github.com/benbalter/jekyll-optional-front-matter
diff --git a/_includes/latest_covers.html b/_includes/latest_covers.html
index 9ece7de..ff3c533 100644
--- a/_includes/latest_covers.html
+++ b/_includes/latest_covers.html
@@ -4,34 +4,34 @@
-Gems in the Smithsonian Institution
The Glebe 1914/01 (Vol. 1, No. 4): Love of One's Neighbor
The Tank Corps
Chambers's Journal of Popular Literature, Science, and Art, No. 743, March
Gibson: New Cartoons; A book of Charles Dana Gibson's latest drawings
Tündér Ilona
Thoughts on a Pebble, or, A First Lesson in Geology
Ne bántsuk egymást: Ujabb tréfák
Vampires and Vampirism
Contes cruels
The Jugglers
Historia del famoso predicador Fray Gerundio de Campazas, alias Zotes (1 de 2)
Your 1952 Studebaker Champion: Owner's Guide
The Rare Earths: Their Occurrence, Chemistry, and Technology
Paradise lost. French
Sweet Clover: Harvesting and Thrashing the Seed Crop
Sketches and Cartoons
Yodogima: In Feudalistic Japan
Tommy Remington's Battle
Discours sur les révolutions de la surface du globe. English